In Trojan terminology, what is a covert channel?

In Trojan terminology, what is a covert channel?

A . A channel that transfers information within a computer system or network in a way that violates the security policy
B . A legitimate communication path within a computer system or network for transfer of data
C . It is a kernel operation that hides boot processes and services to mask detection
D . It is Reverse tunneling technique that uses HTTPS protocol instead of HTTP protocol to establish connections

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Answer: A