Say whether each of the following is a rule, a strategy, or a payoff.
a. In chess, when you capture your opponent’s king, you win the game.
b. In Monopoly, players frequently mortgage their existing properties to raise cash to buy new ones.
c. In chess, the rook piece can move any number of spaces directly forward, back-ward, or to either side, but it cannot move diagonally.
d. In rock-paper-scissors, you might always play rock.