Question: The assignment problem constraint x31 + x32 + x33 + x34 <= 2 means
a. agent 2 can be assigned to at most 3 tasks.
b. agent 3 can be assigned to at most 2 tasks.
c. a mixture of agents 1, 2, 3, and 4 will be assigned to 2 or less tasks.
d. there is no feasible solution.