My computer screen keeps flashing black, it's on a very low brightness level and i very rarely put it up to high level unless i really need to. what could be causing the problem, and what is the solution?

Auser is given read permission to a file stored on an ntfs-formatted volume. the file is then copied to a folder on the same ntfs-formatted volume where the user has been given full control permission for that folder. when the user logs on to the computer holding the file and accesses its new location via a drive letter, what is the user's effective permission to the file? a. read b. full control c. no access d. modify e. none of the above