Consider a two-player game in which each player's strategy set is {0, 1, ..., 5}. If q1 and q2 denote the strategies of players 1 and 2, respectively, then Player 1's payoff is:
a. (12 - 2q1 - q2)q1
b. (12 - 2q1 - q2)q2
c. 12 - 2q1 - q2
d. q1 - 2q2