Several offices are connected with VPNs using static IPv4 routes. An administrator has been tasked with implementing OSPF to replace static routing. Which step is required to accomplish this goal?

Assigning an IP address to tunnel interfaces is a fundamental prerequisite for any routing over a tunnel, including static routes, but it is not the specific step that *implements OSPF* to replace static routing.

OSPFv3 is the version of OSPF designed for IPv6, whereas the question refers to static IPv4 routes, implying that OSPFv2 (or simply OSPF) is the appropriate protocol, not OSPFv3.

Implementing OSPF requires enabling the OSPF process on all relevant interfaces, including both physical Ethernet interfaces and VPN tunnel interfaces, and assigning them to an OSPF area, with 0.0.0.0 being the common backbone area for IPv4 OSPF (OSPFv2).

Creating new VPN zones is related to security policy management and controlling traffic flow, not a direct configuration step for implementing OSPF routing.