If MP_a/P_a = MP_b/P_b and MRP_a/P_a = MRP_b/P_b > 1,this

If MP_a/P_a = MP_b/P_b and MRP_a/P_a = MRP_b/P_b > 1,this firm is:

A) producing its output with the least costly combination of resources but is not producing the profit-maximizing output.
B) maximizing profits but failing to minimize costs.
C) neither maximizing profits nor minimizing costs.
D) combining resources a and b so as to minimize costs and maximize profits.