Answer:
D is the suitable answer.
Explanation:
All of the above
Gamma rays are not used for communication.
-- We have no safe way to generate them.
-- We have no cheap way to detect them.
-- We have no way to impress information on them (modulate them).
-- They're dangerous.
Otherwise they're ideal for communication.
Answer:
The statement is True
Explanation:
When talking about computer security, we can define covert channels as an attack on a system capable of creating a loophole for information objects transfer between various processes that would normally not allow communication under the computer security policy. Hence, the best defenses system against this kind of attack is via Intrusion Defense System and Intrusion Prevention System and relentlessly "watching all aspects of an IT infrastructure for aberrant or abnormal events of any type."