which of the following security threats?

A user receives a phone call from a person claiming to be from technical support. This
person knows the user’s name and that the user has Windows installed on their computer.
The technician directs the user to open Event Viewer and look at some event log entries to
demonstrate the effects of a virus on the computer. The technician also asks the user for
their user ID and password so that they can clean the computer. This is an example of which
of the following security threats?

A.
Social engineering

B.
Phishing

C.
Malware

D.
Virus

Explanation:

Reference:
http://www.pcworld.com/article/182180/top_5_social_engineering_exploit_techniques.html