When the Firms in an Oligopoly Are in a Cooperative

When the firms in an oligopoly are in a cooperative equilibrium and are maximizing their joint profits,which of the following statements is true?

A) An individual firm could increase profits by cheating.
B) P > MC for each individual firm.
C) MR > MC for each individual firm.
D) The firms in the industry will jointly be earning monopoly profits.
E) All of the above statements are true.