Refer to the exhibit.

Which statement is true about the downward bit?

A.
It forces the CE router to use a backup link instead of sending traffic via MPLS VPN.

B.
It informs the PE router that the LSA metric has been recently decreased to 1 and that partial SPF
calculation cannot be delayed.

C.
It forces the CE router to install the LSA with the downward bit set into its routing table as a
discard route.

D.
It informs the PE router that the LSA was already redistributed into BGP by another PE router and
that the LSA must not be redistributed into BGP again.