In a standard, two-player Prisoner's Dilemma type game, the collusive (cartel) agreement outcome is ________ than the Nash equilibrium and __________.

a. Better for both players ; is stable b. Worse for both players ; is not stable c. Both (a) and (b) are true. d. Neither (a) nor (b) is true.

Better for both players and is not stable?

Please correct this

Thank you!