You are configuring a firewall to allow access to a server hosted on the DMZ. You open TCP/IP ports 80, 25, 110, and 143. Assuming that no other ports on the firewall need to be configured to provide access, which applications are most likely to be hosted on the server?
a) HTTP, SMTP, POP3, IMAP
b) HTTPS, DNS, FTP, SNMP
c) FTP, Telnet, DNS, LDAP
d) HTTPS, SMTP, POP3, SNMP