Which of the following activities will NOT be considered as passive footprinting?

Which of the following activities will NOT be considered as passive footprinting?

A.
Go through the rubbish to find out any information that might have been discarded.

B.
Search on financial site such as Yahoo Financial to identify assets.

C.
Scan the range of IP address found in the target DNS database.

D.
Perform multiples queries using a search engine.

Explanation:
Passive footprinting is a method in which the attacker never makes contact with the target systems. Scanning the range of IP addresses found in the target DNS is considered making contact to the systems behind the IP addresses that is targeted by the scan.