An employee reported that a suspicious individual was looking through the recycle bin. Which of the following types of social engineering threats is this?

Phishing uses deceptive electronic communications (typically email) to trick users into revealing credentials or clicking malicious links; it does not involve physical searching.

Spear phishing is a targeted form of phishing directed at a specific individual or organization using personalized information, still conducted through electronic means.

Dumpster diving involves an attacker physically going through a target organization's waste - such as a recycle bin - to find documents, printed reports, hardware, or other materials containing sensitive data like credentials, account numbers, or internal procedures. This scenario precisely describes that activity.

Impersonation involves an attacker pretending to be a trusted person or authority figure in person or over a communication channel, not searching through physical waste.