Answer :
The allow-exception rule could create a bottleneck, slowing down traffic to and from the Internet is a possible problem. Thus, option D is correct.
What is an email?
An email has taken the place of all other forms of communication because it allows us to send quick attachments like images and even films, and we can do it from anywhere using any technology we happen to have at the time.
Communication from and through the World wide web could be slowed down by the allow-exception condition, which is a potential issue of the system.
Therefore, option D is the correct option.
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The question is incomplete, the complete question is:
A. Lenita used the wrong port. SMTP uses port 21.
B. The allow-exception rule could create a loophole threatening internal communications on the same port.
C. Lenita should have used a deny-exception rule just prior to the Allow rule.
D. The allow-exception rule could create a bottleneck, slowing down traffic to and from the Internet.