The correct answer is Parallel run.

A Parallel run test executes the same processing at the secondary site while the production facility continues to operate normally. This approach lets teams compare outputs and verify that the recovery site produces accurate results without interrupting live operations.

Cold site activation is incorrect because a cold site is a standby location that lacks active systems and current data and must be provisioned and loaded before it can process transactions. It does not run concurrently with production.

Tabletop walkthrough is incorrect because it is a discussion based exercise where participants review plans and responsibilities rather than execute systems or process real workloads. No parallel processing occurs in a walkthrough.

Full interruption test is incorrect because it involves stopping production and failing over to the alternate site. That scenario does not keep the production facility operating normally while the secondary site runs.

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