ISC2 CISSP Practice Question

Parallel testing is the correct approach for this scenario. In parallel testing, the disaster recovery (DR) systems are activated at the alternate site while the primary systems continue to operate normally. This allows an organization to verify that the recovery site can handle the required processing load and function correctly without disrupting normal business operations.

Interruption testing would cause a disruption to normal business operations, as it involves shutting down the primary site and shifting operations to the recovery site. Read-through/tabletop exercises don't actually involve activating systems and therefore cannot validate processing capability. Simulation testing involves creating a simulated disaster environment but typically doesn't involve processing actual production workloads, which is necessary to validate the recovery site's capability to handle the company's transaction processing system.