The Blue Colonies in the Illustration Below

The blue colonies in the illustration below.

A) Produce a functional beta-galactosidase protein that converts a clear lactose analog to a blue-colored product.
B) Produce an inactive beta-galactosidase protein that does not hydrolyze the blue lactose analog.
C) Naturally produce a blue pigment.
D) Produce lysozyme which breaks open the cells to release the inner blue pigment.