Which of the following is the best way an attacker can passively learn about technologies used in an organization?

A.
By sending web bugs to key personnel

B.
By webcrawling the organization web site

C.
By searching regional newspapers and job databases for skill sets technology hires need to possess in the organization

D.
By performing a port scan on the organization’s web site

Explanation:
Note: Sending web bugs, webcrawling their site and port scanning are considered "active" attacks, the question asks "passive"