which two ports need to be opened?

If the firewall is enabled on the Oracle VM VirtualBox, which two ports need to be opened?

A.
Port 20

B.
Port 443

C.
Port 119

D.
Port 22

E.
Port 163

Explanation:
http://docs.oracle.com/html/E26214_02/firewalls.html#firewalls-vdi-providers