in a HyperMetro active-active data center solution, which statement is true about the active-active deployment of the B/S application?

in a HyperMetro active-active data center solution, which statement is true about the active-active deployment of the B/S application?
A . A unified SLB resource pool is established for the primary and secondary sites, and all web servers are added to this pool.
B . Web servers at the primary and secondary sites compose a web cluster across sites.
C . Application servers compose a cluster across sites.
D . Databases do not need to compose a cluster across sites.

Answer: A