In Regard to Gladiators, Which of the Following Is True

In regard to gladiators, which of the following is true?

A) the term gladiator originates from a weapon called a "gladius".
B) gladiators were divided into 4 specialties and would fight each other as spectators placed bets on who would survive.
C) not all gladiator combats ended in death, gladiators were expensive to train and their owners did not want to loose their investment.
D) some freemen desired to live the life of the gladiator, these individuals were known as auctorati and entered into an arrangement with a lanista, an entrepreneur, who bought and sold gladiators.
E) All of the above.