Which of the following is NOT one of the basic search methods?

The method identified as diagonal is not recognized as one of the basic search techniques typically studied in fire tactics. The standard search method involves systematic grid approaches or line searches designed for efficient coverage of an area. The large area search is utilized for expansive spaces, ensuring that firefighters can effectively locate victims or hazards across wider regions. The oriented search method focuses on leveraging environmental cues and landmarks to guide searches, increasing efficiency and thoroughness.

In contrast, the diagonal method does not represent a commonly accepted structured approach within fire tactics training. Thus, recognizing the foundational search methods involves understanding their systematic, organized approaches, each serving specific operational needs during emergency responses.