If R = X I + Y J + Z

Multiple Choice

If r = x i + y j + z k and k is a constant vector field in R³, then

A) div ( k × r) = 0
B) div ( k × r) = 0.
C) grad ( k . r) = 2k
D) curl ( k × r) = 0
E) curl ( k × r) = 0.