What is a public key infrastructure? select one: a. a structure that enables parties to use communications such as email b. a structure that provides all of the components needed for entities to communicate securely and in a predictable manner c. a structure that enables secure communications in chat rooms, instant messaging, and text messaging d. is a method of securing communications through the use of a single shared key

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