Which of the following activities would not be considered passive footprinting?

Which of the following activities would not be considered passive footprinting?

A.
Search on financial site such as Yahoo Financial

B.
Perform multiple queries through a search engine

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

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

Explanation:
Passive footprinting is a method in which the attacker never makes contact with the target. Scanning the targets IP addresses can be logged at the target and therefore contact has been made.