Which of the following would help confirm a diagnosis of Alzheimer's Dementia while ruling out a diagnosis of Dementia due to Head Trauma?
a. anterograde and retrograde amnesia appear at about the same time
b. anterograde amnesia appears first; after a period of time, retrograde amnesia appears
c. retrograde amnesia appears first and gradually worsens; after a period of time, anterograde amnesia appears
d. anterograde and retrograde amnesia appear at about the same time but the retrograde amnesia begins with impairments in recent memory and then progresses to impairments in remote memory