Which One of the Following B Cell Responses Is NOT $\kappa$

Multiple Choice

Which one of the following B cell responses is NOT stimulated by CD40 ligand?

A) Association of TRAFs with the cytoplasmic tails of CD40 molecules
B) Activation of NF- $\kappa$ B
C) Enhanced expression of B7-1 and B7-2
D) Enhanced Ig isotype switch recombinase activity
E) Enhanced production of membrane Ig