Research on the Effects of a 'Mugshot' on Later Identifications

Research on the effects of a 'mugshot' on later identifications in a line-up indicates that:

A) subjects who view mugshots are more likely to make the correct choice in a later line-up
B) subjects who view mugshots are less likely to make the correct choice in a later line-up
C) subjects are more likely to make the correct choice if they watch the mugshots after the line-up
D) subjects are more likely to make the correct choice if they watch the mugshots before the line-up
E) none of the above