Which of the Following Best Describes Situational In-Vivo Exposure Treatment

Which of the following best describes situational in-vivo exposure treatment?

A) a process by which a client confronts fears by imagining confronting feared situations and stimuli
B) a process by which a client gradually exposures herself to a feared situation by entering a remaining in the situation until anxiety diminishes.
C) a process by which a client learns to confront irrational and catastrophic cognitions during exposure therapy
D) a process by which a client exposes herself to a feared situation through the process of flooding, or immediately exposing herself to the most anxiety-provoking situation on a hierarchy