Updating the plan periodically has the greatest positive impact on the ability to execute a disaster recovery plan (DRP). This is because an up-to-date plan is more likely to reflect the current environment, and any potential risks or issues can be addressed before an emergency arises. Storing the plan at an offsite location, communicating the plan to all stakeholders, and conducting a walk-through of the plan are all important steps, but they do not have the same impact as regularly updating the DRP.