单项选择题

A.On Server2, create a new application pool, and then associate the application pool with a new Web site.
B.On Server2, configure the SMTP service to accept anonymous connections and to relay e-mail messages.
C.On Server1, create a new application pool. On an internal DNS server, create a new MX record for Server1.
D.On Server1, create a new application pool. On an internal DNS server, create a new MX record for Server2.