A. Create PTR records and point the IP address of the server back to www, ftp, and mail.
B. Create an A record pointing to the server’s IP address and create CNAME records for www, ftp, and mail and point those to the A record.
C. Create an A record for www, ftp and mail, and point it to the ALIAS of the server.
D. Create CNAME records for www, ftp, and mail and point those to the A record already provided to the instance by AWS.