What Is the Difference Between a Positive Hypnotic Hallucination and a Negative

What is the difference between a positive hypnotic hallucination and a negative hypnotic hallucination?

A) A positive hallucination makes you perceive something pleasant and a negative hallucination makes you perceive something unpleasant.
B) A positive hallucination makes you perceive something that isn't there and a negative hallucination makes you not perceive something that is really there.
C) A positive hallucination will be remembered posthypnotically and a negative hallucination will not be remembered posthypnotically.
D) A positive hallucination involves the performance of a response and a negative hallucination involves the inhibition of a response.