A hacker could obtain passwords without the use of computer tools or programs through the technique of:

A. social engineering.

B. sniffers.

C. back doors.

D. Trojan horses.

Explanation:

Social engineering is based on the divulgence of private information through dialogues, interviews, inquiries, etc., in which a user may be indiscreet regarding their or someone elses personal datA. A sniffer is a computer tool to monitor the traffic in networks. Back doors are computer programs left by hackers to exploit vulnerabilities. Trojan horses are computer programs that pretend to supplant a real program; thus, the functionality of the program is not authorized and is usually malicious in nature.