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

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

A.
redistributeospf 1

B.
redistributeospf 1 match external 1

C.
redistributeospf 1 match external 2

D.
redistributeospf 1 match external 1 external 2