Which of the following description about BGP, OSPF, ISIS, RIP is correct?
A . The BGP neighbor relationship is based on the TCP session. The port number used is 179.
B . OSPF runs on the basis of the IP protocol, and the protocol number used is 90.
C . ISIS runs on the basis of the IP protocol and the protocol number used is 89.
D . RIP runs on the basis of UDP drawing, and the port number used is 179.
Answer: A