Which of the following occurs in the brain of a person who is hallucinating?

There is heightened ability to determine the source of images and sounds.
The frontal lobes show heightened activity suggesting that the person is able to monitor and determine the source of the images or sounds.
Activity in the visual cortex during visual hallucinations shows similarity to the brain activity that occurs when visual stimulus is present.
Wernicke's area exhibits poor activity and thereby renders poor speech comprehension.