The correct answer is Activity explorer.

The Activity explorer is intended for investigating user and administrator actions and trends across Microsoft 365 and not for inspecting file contents or message bodies to apply sensitivity labels. It is useful for activity analysis but it does not perform content evaluation or automatic tagging across storage locations.

Sensitive information types are pattern based detectors used by Microsoft Purview to find and classify content such as credit card numbers and national identifiers, and they are commonly used to evaluate and apply labels.

Trainable classifiers are machine learning models that you train to identify specific types of documents or email content, and they can be used to classify and auto label content across your locations.

Exact data match sensitive information types use hashed values from authoritative data sources to find exact matches in documents and messages, and they are used when precise matching is required for labeling and DLP.

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