Refer to the exhibit.

Which two configuration options can be used to optimize the IS-IS network scenario?

A.	Change the R1 and R2 IS type to Level 2.
B.	Change the R1 and R2 IS type to Level 1.
C.	Change the gi0/0 interface IS-IS circuit type on R1 and R2 to Level 2 only.
D.	Change the gi0/1 interface IS-IS circuit type on R1and R2 to Level 1.
E.	Change the IS type for all the routers to Level-1-2.
F.	Change the IS-IS network type for all the routers to point-to-point.