Which of the Following Relations Is the Slope Along a Given

Multiple Choice

Which of the following relations is the slope along a given isoquant?

A) dQ = {F(K, L) /K} dK + {F(K, L) /L} dL, where dQ > 0
B) 0 = {F(K, L) /L} dK + {F(K, L) /K} dL
C) 0 = {F(K, L) /K} dK + {F(K, L) /L} dL
D) dQ = {F(K, L) /K} dL + {F(K, L) /L} dK, where dQ > 0