A. An unauthorized person attempts to gam access to secure premises by following an authonzed person through a secure door.

B. A hacker walks around an office building using scanning tools to search for a wireless network to gain access.

C. An employee is induced to reveal confidential IP addresses and passwords by answering questions over the phone.

D. An intruder eavesdrops and collects sensitive information flowing through the network and sells it to third parties.