Which equation represent a production function with perfectly substitutable inputs? hint: perfectly substitutable inputs are substitutable at any constant rate, and not necessarily a rate of 1:1.

(select each correct answer)

a. q = sqrt K + sqrt L

b. q = sqrt K + L

c. q = sqrt KL

d. q= sqrt (K+L)

e. q = KL

f q = K + L

g. q = 4K + L

h. q = 4K + 4L

i = q = min {K,L}

j q = min { sqrt K, sqrt L}