35. You have an external DNS server that has been the target of a lot of traffic directed at SMTP lately. The server is required to make and respond to name resolution queries only. You examine the configuration of the server and find that the sendmail utility is configured and running on the host, and the server is also listening for inbound connections on TCP port 25. Which of the following actions should you take? (A) Disable sendmail and any other program using TCP port 25. (B) Configure sendmail to send and receive e-mail from designated hosts only. (C) Disable the name resolution services on the host. (D) Configure DNS service to block inbound e-mail into the host.