Why is depth-limited minimax sometimes preferable to minimax without a depth limit?
a. Depth-limited minimax can arrive at a decision more quickly because it explores fewer states
b. Depth-limited minimax can make a more optimal decision by not exploring states known to be suboptimal
c. Depth-limited minimax is never preferable to minimax without a depth lirit
d. Depth-limited minimax will achieve the same output as minimax without a depth limit, but can sometimes use less memory