Question: Who created Fall Martin while being a Field Marshal in the Wehrmacht of Nazi Germany during World War II?
Context: Ferdinand Schörner (12 June 1892 – 2 July 1973) was a general and later Field Marshal in the Wehrmacht of Nazi Germany during World War II.  He commanded several army groups and was the last commander of the Oberkommando des Heeres (Supreme Command of the Army, the OKH). Fall Martin ("Case Martin") was a plan created by Field Marshal Gerd von Rundstedt in late 1944 during World War II.  The plan envisaged a two-pronged attack aimed at the Allied forces in eastern Belgium and Luxembourg. Walter Karl Ernst August von Reichenau (8 October 1884 – 17 January 1942) was a field marshal in the Wehrmacht of Nazi Germany during World War II.  A professional solider and veteran of World War I and the Reichswehr, he was one of twelve officers promoted at the 1940 Field Marshal Ceremony, and the most junior.  An avid sportsman and athlete he was a member of the International Olympic Committee.  He is widely cited for his support of genocidal policies on the Eastern front and for his Severity Order, which he issued while in command of the German 6th Army. Wilhelm Keitel (22 September 1882 – 16 October 1946) was a German field marshal who served as Chief of the Armed Forces High Command ("Oberkommando der Wehrmacht" or OKW) in Nazi Germany during World War II.  According to David Stahel, Keitel was "well known and [...] reviled as Hitler's dependable mouthpiece and habitual yes-man" among his military colleagues. Erwin Rommel (15 November 1891 – 14 October 1944) was a German general and military theorist.  Popularly known as the Desert Fox, he served as field marshal in the Wehrmacht of Nazi Germany during World War II. Kurt Wilhelm Albert Karl Agricola (15 August 1889 – 27 December 1955) was a general in the Wehrmacht of Nazi Germany during World War II who held senior level occupational rear-security commands in the occupied Soviet Union.  A native of Saxony, Agricola entered army service in 1908 and served during World War I.  During the interwar era, he held staff assignments and continued to rise through the army's ranks in the Wehrmacht of Nazi Germany.  His career ended stalled in January 1939, when he was sent into retirement on political grounds because of his marriage to Martha born Hahn, a Jewish woman.  Reactivated again upon the start of World War II, Agricola received exclusively positions behind the front line.  As rear area commander of the 2nd Army in the occupied Soviet union during 1941–43, Agricola brought changes in the Wehrmacht's harsh occupation policies and was successful in maintaining control of his area of occupied territory from Soviet partisans.  Shortly after the war's end, he was arrested by Soviet authorities, convicted of war crimes and remained in captivity for a decade.  One of the last German prisoners in the Soviet Union, he was released in October 1955 and died shortly thereafter in West Germany. Maximilian von Weichs (12 November 1881 – 27 September 1954) was a field marshal in the Wehrmacht of Nazi Germany during World War II.  He commanded several armies and army groups, including the 2nd Army during Operation Barbarossa and Army Group B during the Battle of Stalingrad in 1943. The Bila Tserkva massacre was the World War II mass murder of Jews, committed by the Nazi German "Einsatzgruppe" with the aid of Ukrainian auxiliaries, in Bila Tserkva, Soviet Ukraine, on August 21–22, 1941.  When the Jewish adult population of Bila Tserkva was killed, several functionaries complained that some 90 Jewish children were left behind in an abandoned building, and had to be executed separately.  The soldiers reported the matter to four chaplains of the Wehrmacht, who passed along their protests to Field Marshal von Reichenau; it was the only time during World War II that Wehrmacht chaplains tried to prevent an "Einsatzgruppen" massacre, nevertheless Blobel's verbal order was direct and decisive. Karl Rudolf Gerd von Rundstedt (12 December 1875 – 24 February 1953) was a Field Marshal in the Wehrmacht of Nazi Germany during World War II. The Honour Cross of the World War 1914/1918 (German: "Das Ehrenkreuz des Weltkriegs 1914/1918" ), commonly, but incorrectly, known as the Hindenburg Cross was established by Field Marshal Paul von Hindenburg, President of the German Republic, by an order dated 13 July 1934, to commemorate service of the German people during the First World War.  This was Germany's first official service medal for soldiers of Imperial Germany who had taken part in the war, and where they had since died it was also awarded to their surviving next-of-kin.  Shortly after its issuance, the government of Nazi Germany declared the award as the only official service decoration of the First World War and further forbid the continued wearing of German Free Corps awards on any military or paramilitary uniform of a state or Nazi Party organization.
Answer: Gerd von Rundstedt