The requirement is to selectively redirect a specific traffic type within a tenant's network to a service (like a firewall) without affecting all other traffic. Filter-based forwarding (FBF) is the ideal solution. FBF uses a firewall filter to match specific traffic based on criteria like protocol or port numbers. When traffic matches the filter, an action redirects it to a different next-hop or routing instance that points to the firewall. All other non-matching traffic is forwarded normally within the tenant's VRF, satisfying all requirements.

A. Route leaking is used to share routes between different VRFs, not to steer traffic based on its type within a single VRF.

C. Placing the server on a unique subnet only provides L3 separation; it does not inherently filter or redirect specific traffic types.

D. A static route would redirect all traffic destined for the server to the firewall, not just a specific traffic type as required.

1. Juniper Networks TechLibrary. (2023). Filter-Based Forwarding Overview. "Filter-based forwarding (FBF) provides a mechanism to forward packets based on a configured filter... You can use FBF to route traffic to specific destinations or to policy-based routing." Retrieved from https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/concept/filter-based-forwarding-overview.html

2. Juniper Networks TechLibrary. (2023). Example: Configuring Filter-Based Forwarding for Specific Traffic. This document provides a direct example of using a firewall filter to match traffic and forward it to a different routing instance, which is the core of the solution. Retrieved from https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/example/filter-based-forwarding-example.html