All of the following are defensive measures except:

A) black night.
B) staggered board elections.
C) super majority voting rules.
D) poison pills.

Staggered Board

A corporate board of directors structure where members are divided into classes serving different term lengths, making it difficult for a complete board takeover in any single election.

Poison Pills

A defensive strategy used by companies to deter hostile takeovers by making the company less attractive to potential acquirers.