What is a possible reason for this issue?

— Exhibit —

— Exhibit —

A vApp named AppSilo contains four virtual machines. Each machine is named for the resource it
offers: FTP01, RDP01, HTTP01, and SYSLOG01.
An administrator discovers that FTP01 is unable to receive FTP traffic from outside the vApp.
What is a possible reason for this issue?

A.
The latest firewall changes have not been applied.

B.
The FTP Inbound rule was created above the Allow all outbound rule.

C.
The FTP inbound rule was created with a source of external.

D.
The Block RDP Traffic rule was not disabled.