How does a concave lens differ from a convex lens?

Responses
A A convex lens is another way to describe a plane mirror; a concave lens is curved.A convex lens is another way to describe a plane mirror; a concave lens is curved.
B A concave lens us curved inward on both sides; a convex lens is curved on only one side.A concave lens us curved inward on both sides; a convex lens is curved on only one side.
C A convex lens has a thick center and thin edges; a concave lens has a thin center and thicker edges.A convex lens has a thick center and thin edges; a concave lens has a thin center and thicker edges.
D A convex lens has a thin center and thick edges; a concave lens has a thick center and thiner edges.

C A convex lens has a thick center and thin edges; a concave lens has a thin center and thicker edges.