Dumpster diving refers to:

• A. Looking at either the user's keyboard or screen while he/she is logging in
• B. Dumpster diving refers to searching for sensitive information in the user's trash bins and printer trash bins, and searching the user's desk for sticky notes
• C. Convincing people to reveal the confidential information
• D. Creating a set of dictionary words and names, and trying all the possible combinations to crack the password

Answer: (B)

Dumpster diving is the practice of rummaging through discarded materials to find sensitive information that users have thrown away, such as printed documents, notes with passwords, or discarded drives. It targets trash bins, printer waste, and even desk clutter like sticky notes, because people often underestimate what they throw away. This is why the correct choice points to searching trash, printer debris, and related disposable items.

The other techniques describe different attack methods: watching someone enter credentials (shoulder surfing), persuading people to reveal information (social engineering), or systematically cracking passwords with a list of common words and names (dictionary or brute-force attack). Those are separate approaches and not about exploiting discarded materials.