The players in a two-person game are choosing between Strategy X and Strategy Y. If the second player chooses Strategy X, the first player's best outcome is to select X. If the second player chooses Strategy Y, the first player's best outcome is to select X. For the first player, Strategy X is called a

a.
cartel strategy.

b.
repeated-trial strategy.

c.
dominant strategy.

d.
collusive strategy.