Adam recently ran a network port scan of a web server running in his organization. He ran the scan from an external network to get an attacker's perspective on the scan. Which one of the following results is the greatest cause for alarm?
A. 80/open
B. 22/filtered
C. 443/open
D. 1433/open

Option D i.e., 1433/open.

Explanation:

Whenever an internet network operating within their company was performing a server port check currently. He was running that analysis from such an outside network to provide the search view of an intruder. So, the findings of 1433 are the biggest cause of alarm.

Just accessible ports actually pose major protection threats. On such an internet network, port Eighty & port 443 both supposed to be available. Port 1433 seems to be a storage port to which an outside server must never be revealed.

That's why the other option are incorrect according to the above statements.