In the given scenario, what did the source document state about the exercise?

The correct choice indicates that the source document outlines a structured approach to the exercise, particularly highlighting that it consists of a preparation phase followed by execution. This suggests a clear sequence of activities where preparatory steps will be taken to ensure that the execution phase is carried out effectively. In the context of exercises, which often involve simulations or drills, having defined phases is crucial for organization and success. Furthermore, this approach aligns with common practices in operational planning, where preparation is necessary to inform and streamline the subsequent execution.

The other options do not capture the central aspect of the document's content about the exercise structure. The mention of duration, location, or classification does not pertain to the core operational framework that is highlighted by the correct answer. It is the phased structure that is key for participants to understand their roles and the timeline within the exercise.