Let f be a scalar field and F a vector field. Indicate which of the following are

Question:

Let f be a scalar field and F a vector field. Indicate which of the following are scalar fields, vector fields, or meaningless.
(a) Div f
(b) Grad f
(c) Curl F
(d) Div (grad f)
(e) Curl (grad f)
(f) Grad (div F)
(g) Curl (curl F)
(h) Div (div F)
(i) Grad (grad f)
(j) Div (curl grad f)
(k) Curl (div (grad f))