Picture with more than one mask

Hi all,

I`m sure this has been discussed before and there must be a simple solution. I have a picture and on top of that I would like to have another picture appear with a special mask sequence (fairly easy… 6 parts of the pictures should appear in consecutive order). whats the best way to get at this?

A) rip the picture apart and fade the single parts in?
B) AS
C)have a several masks and fade them in?

thanks for the feedback,
m.