Final answer:
A Tabletop Exercise is the most suitable choice for a company to test their incident response plan without engaging in complex simulations or incurring high costs, as it facilitates a thorough review of the IRP in a hypothetical but realistic scenario.
Step-by-step explanation:
The best option for the company to test their incident response plan (IRP), given the constraints of not engaging in a full-blown simulation and avoiding extensive investment and planning, is to conduct a Tabletop Exercise. A Tabletop Exercise allows the company to walk through the IRP step-by-step, discussing the actions they would take in the event of a hypothetical incident
This approach provides an effective, low-cost method to identify gaps in the IRP and does not require the resources that would be needed for a more elaborate simulation, such as a Full-scale Simulation or a Mock Incident Drill. Moreover, it is more focused on strategic decision-making than the tactical engagement of a Red Team Assessment, making it ideal for testing the plan at a higher level.