Which command ensures a router with higher HSRP priority becomes active after it reloads?

The standby 10 preempt command is correct because it enables preemption for HSRP group 10. Preemption allows a higher-priority router to take over the active role from a lower-priority router, even if the lower-priority router became active first. Without preemption, a router that comes online with a higher priority will remain in the standby state if the current active router is already functioning, even if it has a lower priority. standby 10 version 1 and standby 10 version 2 specify the HSRP protocol version, not preemption behavior. While HSRPv2 offers enhancements, neither command directly addresses the scenario of a higher-priority router taking over after a reload. standby 10 priority 150 sets the HSRP priority for the router. While a higher priority is necessary for a router to potentially become active, it doesn't guarantee it will take over if preemption is not enabled.