which Cisco IOS configuration mode is the route distinguisher (RD) configured?

In which Cisco IOS configuration mode is the route distinguisher (RD) configured?

A.
R1(config-route-at)#

B.
R1(config-route-map)#

C.
R1(config-it)#

D.
R1(config-vrf)#

E.
R1(config)#

F.
R1(router)#