which of the following components in a Provider-1 NGX deployment can a SmartCenter Server be configured as a backup?

For which of the following components in a Provider-1 NGX deployment can a SmartCenter Server be configured as a backup?

A.
MLM

B.
Secondary MDS

C.
Primary MDS and a Secondary CMA

D.
Primary CMA not backed up by a Secondary CMA

E.
Primary MDS