As a condition of being allowed to apply for a job with Good Hands Industries, Charles is asked to waive his right to object to workplace searches. After signing the waiver, he is offered a job, and he accepts it. Sometime later, he is subjected to a search. If Charles seeks legal redress on the grounds that the search violated his privacy rights, his employer:

A. will be unable to successfully assert the waiver as a defense because it was not given voluntarily.

B. will be unable to successfully assert the waiver as a defense because Charles did not grant it intentionally.

C. will be unable to successfully assert the waiver as a defense because it was given by Charles prior to his job offer.

D. will be able to successfully assert the waiver as a defense because it was given in exchange for valuable consideration.