What term refers to strategies enlisted for intelligence purposes?

The term that best fits the description of "strategies enlisted for intelligence purposes" is typically associated with the overarching activities involved in gathering and utilizing intelligence. While recruitment methods can be a part of intelligence strategies, they specifically refer to the processes used to enlist individuals for information and intelligence gathering.

Counterintelligence operations encompass the broader set of strategic actions taken to protect against espionage and protect intelligence processes. This includes strategies for detecting and countering threats against sensitive information. The other options, such as collection strategies and analysis techniques, pertain to specific processes within intelligence work rather than a general term for strategies overall.

In the context of your question, despite "recruitment methods" being significant, the more accurate term that encapsulates a variety of strategies employed in the intelligence field, including but not limited to recruitment, would lean toward counterintelligence operations, as they include methods for protecting intelligence strategies and can also involve strategic recruitment to safeguard and counter threats.