This command enables IPv4 routing in a layer 3 switch. a. unicast routing O b. routing enable Oc. ipv4 routing O d. ip routing Layer 3 switch route from one VLAN to another using multiple O a. SVIS O b. Routing Tables OC. IP Addresses O d. MAC Addresses What is a characteristic of an IPv4 loopback interface on a Cisco IOS router? a. It is a logical interface internal to the router. O b. It is assigned to a physical port and can be connected to other devices. Oc. The no shutdown command is required to place this interface in an UP state. Od. Only one loopback interface can be enabled on a router