how is R1 learning the route from R2?

Referring to the exhibit, how is R1 learning the route from R2?

A.
R2 has interface ge-0/0/2 configured in another area under OSPFv3.

B.
R2 has an export policy with external type 1 configured.

C.
R2 has interface ge-0/0/2 configured as a passive interface under OSPFv3.

D.
R2 has an export policy with external type 2 configured.