Answer:
C. Escalate the problem to a server administrator to check for issues with the server.
Explanation:
Pinging is a tool or program that IT technicians and professional for testing if a particular host or server is reachable. Since after the support technician pinged the email server from various location and the LAN results in 0% packet loss, this means that the fault is not from the LAN, but that the host server or server administrator is unreachable or have issues. Thus, the next step of troubleshooting is to escalate the issue to the server administrator to check for issues with their server.