What Does the Process of Covert Sensitization for Fetishism Involve

What does the process of covert sensitization for fetishism involve?

A) masturbating while thinking of the fetish object
B) mentally pairing a fetish object with an aversive stimulus
C) pairing electric shock to the arm or leg with the fetish object
D) creating a hierarchy of arousing objects and teaching the patient to relax while thinking of each in turn