Answer:
a. Undercoverage bias
Explanation:
Based on the information provided within the question it can be said that the bias being mentioned is Undercoverage bias. This refers to when a population of a sample are not being represented correctly, which in this scenario is because these people cannot be contacted. Therefore the correct bias that results from this is Undercoverage bias.
Reverse shell is known to be the type of attack that is said to have occurred in the above case.
<h3>What is reverse shell?</h3>
A reverse shell is said to be “connect-back shell,” and it is one that often takes advantage of the computer weakness of the target to start a shell session and it often access the victim's system.
Hence, Reverse shell is known to be the type of attack that is said to have occurred in the above case.
See options below
A.) Man-in-the-Browser (MitB)
B.) Reverse shell
C.) Rootkit
D.) Session hijacking
Learn more about Reverse shell from
brainly.com/question/16607263
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