Which of the following project documents should be used to record the occurrence of an unplanned event?

An action log tracks tasks and follow-up items assigned to team members, not the occurrence of unplanned events or problems.

A risk log records identified potential future threats or opportunities and their response plans, not events that have already occurred.

A change log documents approved or requested changes to project scope, schedule, or cost baselines, not unplanned events that arise during execution.

An issue log (also called an issue register) is specifically designed to capture unplanned events or problems that have materialized during the project, documenting their description, owner, priority, and resolution status so they can be actively managed and resolved.