Which of the following would prevent FTP traffic from reaching a server in the DMZ from the inside n

Given the following set of firewall rules:
From the inside to outside allow source any destination any port anyFrom inside to dmz allow source any destination any port tcp-80
From inside to dmz allow source any destination any port tcp-443
Which of the following would prevent FTP traffic from reaching a server in the DMZ from the inside
network?

A.
Implicit deny

B.
Policy routing

C.
Port forwarding

D.
Forwarding proxy