Alice, bob and cyndy are three users on a linux system. there are three groups alice, bob and cyndy as well and each group has the user with the same name as the member. in addition, assume the user bob is also the group member of the group alice explain the following permissions by showing what rights each user have. a)a file fwith alice as both owner and group owner, and permission 'rw-rw-r- b)a file e with alice as owner and cyndy as group owner, and permission 'rwxr-'. c) a directory d with alice as owner and bob as group owner, and permission