Question: What was the code name of the officers that knew about the plans for d-day invasion of Normandy?
About the article "Invasion of Normandy", section "Codenames".

Candidate passages:
The Allied invasion was detailed in several overlapping operational plans.
According to the D-Day Museum:"The armed forces used code names to refer to the planning and execution of specific military operations.
Operation "Overlord" was the codename for the Allied invasion of northwest Europe.
The assault phase of Operation "Overlord" was known as Operation "Neptune".
Operation "Neptune" began on D-Day (6 June 1944) and ended on 30 June 1944.
By this time, the Allies had established a firm foothold in Normandy.
Operation "Overlord" also began on D-Day, and continued until Allied forces crossed the River Seine on 19 August 1944.
"Just prior to the invasion, General Eisenhower transmitted a now-historic message to all members of the Allied Expeditionary Force.
It read, in part, "You are about to embark upon the great crusade, toward which we have striven these many months."
In his pocket was a statement, never used, to be read out in case the invasion failed. 
Operation Tonga originated in the planning of Operation Overlord, the plan for the eventual invasion of France and the opening of a Second Front in North-Western Europe.
Planning for the invasion of Europe by the Allies had begun in May 1943 when President of the United States Franklin Delano Roosevelt and British Prime Minister Winston Churchill had met at the Washington Conference.
The two Allied leaders decided that all available Allied forces in the theatre should be concentrated in Great Britain, and that planning for the invasion of North-Western Europe should begin.
A provisional target date of May 1944 was set, the code-name Overlord decided upon, and a joint Anglo-American planning staff created under Lieutenant-General Frederick E. Morgan, who was given the title of Chief of Staff to the Supreme Allied Commander (COSSAC).
Planning then began for the invasion of Europe, and even early plans for Overlord called for the commitment of airborne forces to support the ground forces and protect their landing areas.
Operation Skyscraper, for example, called for the deployment of two airborne divisions to land near Caen the east coast of the Cotentin Peninsula in support of an invasion of Normandy by five divisions, whose objective would be the capture of Cherbourg and then breaking out to the east of Normandy.
One ambitious proposal, "Plan C", was put forward by General George Marshall that would have involved a large airborne drop on the Seine, aiming to cut the German forces in half during D-Day itself.
A number of plans were eventually drawn up by Morgan and his cadre of staff officers for the invasion of Normandy, finally deciding that the invasion should take place on a thirty-mile front west of the River Orne, rejecting the need to capture the Pas De Calais and the ports there by calling for the creation of prefabricated artificial ports to ferry equipment and troops ashore once the initial landings had occurred.
Morgan's final plan would utilise three divisions in the first assault, with airborne forces being dropped onto the town of Caen early on the first day to seize the first breakout route.
Following the appointment of General Bernard Montgomery to the command of the 21st Army Group, the plan underwent a number of further revisions, and on 21 January 1944 a revised Overlord plan was presented to General Dwight D. Eisenhower, who had been chosen as the Supreme Allied Commander for the invasion.
The updated and revised plan widened the landing area to include all of the coastline between the River Orne and the eastern coast of the Cotentin Peninsula, to be taken with five divisions, with airborne divisions to land either side of the landing areas to secure their flanks and protect the landing troops from counterattack.
The British airborne forces were to land in the east and the American airborne forces to land to the west of Bayeux to protect the flanks of the infantry and armoured units moving inland from the beaches. 
Utah Beach was the code name for the right flank, or westernmost, of the Allied landing beaches during the D-Day invasion of Normandy, as part of Operation Overlord on 6 June 1944.
Utah was added to the invasion plan toward the end of the planning stages, when more landing craft became available.
Utah Beach, about 3 miles (5 km) long, was the westernmost of the five landing beaches, located between the villages of Pouppeville and La Madeleine, which became the right flank anchor of the Allied offensive along the left bank (western bank) of the Douve River estuary.
The German sector code was W5.
Despite being substantially off course, the US 4th Infantry Division (part of VII Corps) landed with relatively little resistance, in stark contrast to Omaha Beach, where the fighting was fierce. 
Operation Overlord was the code name for the Battle of Normandy, the operation that launched the invasion of German-occupied western Europe during World War II by Allied forces.
The operation commenced on 6 June 1944 with the Normandy landings (Operation Neptune, commonly known as D-Day).
A 12,000-plane airborne assault preceded an amphibious assault involving almost 7,000 vessels.
Nearly 160,000 troops crossed the English Channel on 6 June; more than three million allied troops were in France by the end of August.
Allied land forces that saw combat in Normandy on D-Day itself came from the United Kingdom, the United States and Canada.
Free French Forces and Poland also participated in the battle after the assault phase, and there were also minor contingents from Belgium, Greece, the Netherlands, and Norway.
Other Allied nations participated in the naval and air forces.
The battle for Normandy continued for more than two months, concluding with the closing of the Falaise pocket on 24 August, the Liberation of Paris on 25 August, and the German retreat across the Seine which was completed on 30 August 1944. 
The Allies assigned codenames to the various operations involved in the invasion.
"Overlord" was the name assigned to the establishment of a large-scale lodgement on the northern portion of the Continent.
The first phase, the establishment of a secure foothold, was codenamed "Neptune".
According to the D-day museum:
""The armed forces use codenames to refer to the planning and execution of specific military operations.
Operation Overlord was the codename for the Allied invasion of northwest Europe.
The assault phase of Operation Overlord was known as Operation Neptune.
(...) Operation Neptune began on D-Day (June 6th 1944) and ended on 30 June 1944.
By this time, the Allies had established a firm foothold in Normandy.
Operation Overlord also began on D-Day, and continued until Allied forces crossed the River Seine on 19 August 1944.
""
Officers with knowledge of D-Day were not to be sent where there was the slightest danger of being captured.
These officers were given the codename of "Bigot", derived from the words "To Gib" (To Gibraltar) that was stamped on the papers of officers who took part in the North African invasion in 1942.
On the night of 27 April, during Exercise Tiger, a pre-invasion exercise off the coast of Slapton Sands beach, several American LSTs were attacked by German E boats and among the 638 Americans killed in the attack and a further 308 killed by friendly fire, ten "Bigots" were listed as missing.
As the invasion would be cancelled if any were captured or unaccounted for, their fate was given the highest priority and eventually all ten bodies were recovered.