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What is port scanning?

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in Operating System by (102k points)
What is port scanning?

(a) It is a software used to scan system for attack

(b) It is a software application designed to probe a server or host for open ports

(c) It is software used to scan system for introducing attacks by brute force

(d) None of the mentioned

This question was addressed to me in a job interview.

My question is based upon Security topic in chapter Security of Operating System

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The correct option is (b) It is a software application designed to probe a server or host for open ports

To explain: None.

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