You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Windows Firewall allows the following ports on Server1:·53 ·110 ·135You plan to install a monitoringserver on the network.You need to ensure that the monitoring server can use Server1 to relay e-mail messages. You install the SMTP service on Server1. What should you do next?（）
- AInstall SNMP.
- BInstall the POP3 service.
- CCreate an exception for TCP port 21 in Windows Firewall.
- DCreate an exception for TCP port 25 in Windows Firewall.