Which of the following can be considered a source of information?

Each option presented holds value as a source of information in different contexts.

A record serves as a fundamental source of information containing documented details, data points, or facts about specific events, transactions, or individuals. It provides tangible evidence that can be referenced for decision-making or investigative purposes.

A custodian of record also counts as a source of information since custodians are responsible for maintaining, preserving, and providing access to these records. They serve as contacts for information retrieval and can offer context or insights regarding the data they manage.

A public official represents another source, as they often have access to and control over public records, databases, or information that can be vital for various investigations and decision-making processes. They communicate facts and data that are essential for transparency and public knowledge.

Considering these roles, the answer that incorporates all of these sources is correct because they each contribute uniquely to the understanding and availability of pertinent information in professional environments such as security and protection.