How can the architect implement high availability?

A.
Configure two high-availability pairs: one pair for New York and London, and one pair for
London and Hong Kong.

B.
Configure one cluster instance containing all six appliances.]]>

C.
Configure three high-availability pairs: one pair in New York, one pair in London, and one
pair in Hong Kong.

D.
Configure three high-availability pairs: one pair between New York and London, one pair
between New York and Hong Kong, and one pair between Hong Kong and London.