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Question:

Which social engineering attack was in the case:
A man receives a text message on his phone purporting to be from Technical Services. The text advises of a security breach and provides a web link and phone number to follow up on. He turns over sensitive information when the man calls the number.

A Smishing
Explaination

The use of text messages to socially engineer mobile device users is referred to as smishing. It is, by definition, a mobile-based social engineering attack. Aside than that, it sounds like something a five-year-old might say after killing a bug.