Final answer:
The assertion is true; testing the business continuity plan annually at a walk-through level or higher is essential for ensuring the plan's effectiveness and staff readiness.
Step-by-step explanation:
The statement that each scenario of a business continuity plan is tested annually at a walk-through level or higher is true. Business continuity planning is a critical activity for organizations to prepare for potential disruptions. It involves developing strategies and plans that enable the quick resumption of essential functions following a disaster or operational interruption. Regular testing, including walk-throughs, simulations, and full-scale exercises, is crucial to ensure the plan is effective and that staff is familiar with their roles during an incident. Tests should be comprehensive enough to assess each aspect of the plan and identify any areas in need of revision.