Which two are valid design rules for simple VPN of two PE’s each supporting two CE’s on the same VPN?

Which two are valid design rules for simple VPN of two PE’s each supporting two CE’s on the
same VPN?

A.
Configure different RD’s for all VRF’s.

B.
Configure one import/export RT.

C.
Configure the same RD on all VRF’s.

D.
Configure one VRF per PE router.

E.
Configure one VRF for each site.