A Windows user is locked out of her computer, and you must log into the local administrator account HelpdeskAdmin. Which would you use in the username field?
When logging into a local account on a Windows computer, the username should be entered in the format of either the computer name followed by a backslash () and the username (computername\username), or a period (.) followed by a backslash and the username (.\username).
Option a (//HelpdeskAdmin) or e (\HelpdeskAdmin) would be incorrect as the double forward slash and backslash access network resources rather than a local account. Option b (/HelpdeskAdmin) is also incorrect as the forward slash is not a valid character to separate the computer name and username. Finally, option d (HelpdeskAdmin) alone would not work because the system would try to authenticate against a domain account instead of a local account.