1. y : F(:1:1, 3:2) units of a certain product are produced using two inputs at levels {1:1 and 332 respectively. If 101,102 and p are the input and output prices, the optimal choice of input demand for input 2' must necessarily rise if a. F is differentiable. b. Prot displays increasing differences with respect to (19, ml) for each 2': 1, 2. c. F is concave. d. F displays increasing differences in the two inputs