Which Category to Protocol mapping for NBAR is correct?

A.
Category: Enterprise Applications
Protocol: Citrix ICA, PCAnywhere, SAP, IMAP

B.
Category: Internet
Protocol: FTP, HTTP, TFTP

C.
Category: Network Management
Protocol: ICMP, SNMP, SSH, Telnet

D.
Category: Network Mail Services
Protocol: MAPI, POP3, SMTP