router# show ip route connected 172.19.0.0/16 is variably subnetted, 3 subnet C 172.19.1.0/24 is directly connected, GigabitEthernet0/1.10 C 172.19.2.0/24 is directly connected, GigabitEthernet0/1.20 C 172.19.3.0/24 is directly connected, GigabitEthernet0/1.30 router# show run int gi 0/1.10 ! interface GigabitEthernet0/1.10 encapsulation dot1Q 10 ip address 172.19.1.254 255.255.255.0 end router# show run int gi 0/1.20 ! interface GigabitEthernet0/1.20 encapsulation dot1Q 20 ip address 172.19.2.254 255.255.255.0 end router# show run int gi 0/1.30 ! interface GigabitEthernet0/1.30 encapsulation dot1Q 30 ip address 172.19.3.254 255.255.255.0 end

Router is to be used as a "router-on-a-stick" to route between the VLANs.
All the interfaces have been properly configured and IP routing is operational.
The hosts in the VLANs have been configured with the appropriate default gateway.

What is true about this configuration?

A.	These commands need to be added to the configuration: router(config)# router eigrp 100 router(config-router)# network 172.19.0.0
B.	These commands need to be added to the configuration: router(config)# router ospf 1 router(config-router)# network 172.19.0.0 0.0.3.255 area 0
C.	These commands need to be added to the configuration: router(config)# router rip router(config-router)# network 172.19.0.0
D.	No further routing configuration is required.