Which command should be added to RTB under router bgp 100 to allow only the external OSPF
routes to be redistributed to RTC?

A.
redistribute ospf 1

B.
redistribute ospf 1 match external 1

C.
redistribute ospf 1 match external 2

D.
redistribute ospf 1 match external 1 external 2

Explanation:
Use the external keyword along with the redistribute command under router bgp to redistribute
OSPF external routes into BGP. With the external keyword, you have three choices: 1. redistribute
both external type-1 and type-2 (Default) 2. redistribute type-1 3. redistribute type-2 Enter the
commands in the configuration mode as described here: RTB(config-router)# router bgp 100
RTB(config-router)# redistribute ospf 1 match external.