Which of the following provides a security professional with most information about the system’s security posture?

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Which of the following provides a security professional with most information about the system’s security posture?
A . Wardriving, warchalking, social engineering
B . Social engineering, company site browsing, tailgating
C . Phishing, spamming, sending trojans
D . Port scanning, banner grabbing, service identification

Answer: D