A field technician applied a Group Policy setting to all the workstations in the network. This setting forced the workstations to use a specific SNTP server. Users are unable to log in now. Which of the following is the MOST likely cause of this issue?


A. The SNTP server is offline.
B. A user changed the time zone on a local machine.
C. The Group Policy setting has disrupted domain authentication on the system.
D. The workstations and the authentication server have a system clock difference.