Match the Type of T Cell, Labelled A

Match the type of T cell, labelled a. through e., with its characteristics. (Options may be used more than once or not at all.)
-suppress both B-cell and T-cell activity

A) applies to cytotoxic T cells
B) applies to helper T cells
C) applies to suppressor T cells
D) applies to both helper T and suppressor T cells
E) applies to all three types of T cells