Which of the following is an active penetration testing method?

A.
Searching the WHOIS database for administrator contact information
B.
Running a port scanner against the target’s network
C.
War driving from a target’s parking lot to footprint the wireless network
D.
Calling the target’s helpdesk, requesting a password reset
Wht not D ? Pls explain
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D is social engineering
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I will go with D. Because, SE is also good method in penetration testing or pentest or ethical hacking.
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