Question: Who founded the boxing promotion company which Floyd Mayweather, Jr exercising a provision in his contract
Context: Mayweather Promotions, LLC is a boxing promotional firm founded by five-division world and twelve-time world champion Floyd Mayweather, Jr. in 2007 after exercising a provision in his contract with Bob Arum and Top Rank, that allowed him to become a free agent for the price of $750,000.  Mayweather Promotions also promotes all forms of live entertainment including sporting events, live musical and theatrical events as well as film and television productions.  Mayweather Promotions mainly co-promotes with rival firm Golden Boy Promotions.  Leonard Ellerbe is the CEO. Robert Arum (born December 8, 1931) is an American lawyer, boxing promoter and businessman.  He is the founder and CEO of Top Rank, a professional boxing promotion company based in Las Vegas.  He also worked for the US Attorney's Office for the southern district of New York in the tax division during his legal career before moving into boxing promotion. Top Rank, Inc. is a boxing promotion company founded by Jabir Herbert Muhammad and Bob Arum.  It was incorporated in 1973 and is based in Las Vegas, Nevada. Floyd Mayweather Jr. vs. Manny Pacquiao, billed as "The Fight of the Century", or the "Battle for Greatness", was a professional boxing match between undefeated five-division world champion Floyd Mayweather Jr. and eight-division world champion Manny Pacquiao.  It took place on May 2, 2015, at the MGM Grand Garden Arena in Las Vegas, Nevada.  Mayweather Jr. won the contest by unanimous decision, with two judges scoring it 116–112 and the other 118–110.  Although the fight was considered to be one of the most anticipated sporting events in history, it was largely considered a letdown by critics and audiences alike upon its broadcast. Floyd Mayweather Jr. vs. Robert Guerrero, billed as May Day, was a boxing welterweight championship superfight for Mayweather's World Boxing Council (WBC) Welterweight title and vacant "Ring" Welterweight title.  The bout was held on May 4, 2013, in the MGM Grand Garden Arena at the MGM Grand Hotel & Casino in Las Vegas, Nevada, United States on Showtime PPV.  The bout was the first major televised fight of Mayweather's career to not be aired on HBO PPV.  The card featured some of the rising stars of Mayweather Promotions: J'Leon Love, Badou Jack, Luis Arias, Ronald Gavril and Lanell Bellows.  Mayweather won via unanimous decision with Guerrero winning the first 3 rounds, then Mayweather adjusted and won from the 4th to 12th round. Floyd Mayweather Jr. vs. Conor McGregor, also known as "The Money Fight" and "The Biggest Fight in Combat Sports History", was a professional boxing match between undefeated eleven-time five-division boxing world champion Floyd Mayweather Jr. and two-division mixed martial arts (MMA) world champion and at-the-time current UFC Lightweight Champion Conor McGregor.  The match took place at the T-Mobile Arena in Paradise, Nevada, on August 26, 2017 at the light-middleweight weight class (154 lbs; 69.9 kgs).  It was scheduled for twelve rounds. Floyd Mayweather vs. Juan Manuel Márquez, billed as Number One/Número Uno, was a welterweight superfight which took place on September 19, 2009, at the MGM Grand Arena in Las Vegas between five-division world champion Floyd Mayweather Jr. (39–0, 25 KO) and three-division champion Juan Manuel Márquez (50–4–1, 37 KO).  The fight served as a return to the ring for Mayweather, who, after his knock out victory of Ricky Hatton in December 2007, announced he would take a two-year layoff from boxing which later turned into retirement. Floyd Mayweather Jr. vs. Ricky Hatton, billed as Undefeated, was a boxing superfight that took place on December 8, 2007, at the MGM Grand Garden Arena in Las Vegas, between reigning WBC & "The Ring" welterweight champion Floyd Mayweather Jr. and reigning "The Ring" light welterweight champion Ricky Hatton. Floyd Mayweather Sr. (born October 19, 1952) is an American former professional boxer who competed from 1974 to 1990, and has since worked as a boxing trainer.  Fighting at welterweight during the 1970s and 1980s, Mayweather Sr. was known for his defensive abilities and overall knowledge of boxing strategy.  He is the father and former trainer of five-division boxing champion Floyd Mayweather Jr., and is credited for teaching his son the defensive skills that made him a champion. Kenny Bayless (born 1950) is an American boxing referee from Nevada.  He is best known for having refereed many of the sport's superfights, including Manny Pacquiao vs. Ricky Hatton, Oscar De La Hoya vs. Floyd Mayweather Jr., Ricky Hatton vs. Paulie Malignaggi, Miguel Cotto vs. Antonio Margarito, Manny Pacquiao vs. Miguel Cotto, as well as Floyd Mayweather Jr. vs. Manny Pacquiao.  Bayless's catchphrase, when giving his instructions to the fighters before the opening bell, is "What I say you must obey."
Answer: Muhammad and Bob Arum