The advantage of advertising and sales promotion over other elements of the promotion mix is that they involve two-way communication.

3. A __________ is code inserted into malware that lies dormant until a predefined condition, which triggers an unauthorized act, is met

A. logic bomb B. trapdoor C. worm D. Trojan horse

Which is a major challenge that Facebook is continually facing?

A) user trust for maintaining the privacy of their personal information B) finding more users C) branding D) none of the above