Refer to the exhibit.
Which two statements with regards to the OSPF down bit are true? (Choose two.)
A. The OSPF filter occurs because of OSPF down bit in the step 5 when PE3 redistributes OSPF prefixes onto MP-BGP.
B. The OSPF down bit is set in step 1 when PE1 redistributes OSPF into BGP.
C. The OSPF filter occurs because of the OSPF down bit in step 4 when CE2 advertises OSPF prefixes to CE3.
D. The OSPF down bit is set in step 3 when PE2 redistribute prefixes from MP-BGP into OSPF.
E. The OSPF down bit is set in step 2 when PE2 advertises MP-BGP to other MP-iBGP peers.
