To ensure that some replicated VMs start with a time delay during a failover, creating a failover plan is the appropriate method. A failover plan allows you to specify the sequence and timing for VMs to start, ensuring an orderly and controlled startup process. Adjusting the boot delay in an application group, using pre-freeze/post-thaw scripts, or modifying the failover template file do not specifically address the requirement of timed delays for VM start-up during a failover.