The correct answer is Route table containing user defined routes.

A Route table containing user defined routes lets you create custom routes that override Azure system routes and send traffic destined for the SpokeVNet to the network virtual appliance by specifying the NVAInspect01 IP as the virtual appliance next hop. You apply the route table to the HubVNet subnets where the traffic originates so packets are routed to NVAInspect01 first and then the NVA can forward inspected traffic to the peered SpokeVNet. User defined routes have higher priority than default peering routes so this forces inspection before the traffic reaches SpokeVNet.

The option Azure Firewall is incorrect because Azure Firewall is a separate managed firewall service and using it would require deploying and routing traffic to that service rather than to the existing NVAInspect01. The scenario asks how to ensure inspection by the deployed NVA so Azure Firewall does not meet the requirement.

The option Service endpoint is incorrect because service endpoints extend virtual network identity to specific Azure services and they do not control routing between virtual networks or direct traffic to an NVA.

The option Local network gateway is incorrect because a local network gateway represents an on premises VPN device for VPN connections and it is not used to route traffic between peered virtual networks or to an NVA.

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