Which components should an architect recommend be used to meet the secure remote access requirements while ensuring high availability?

A.
Three NetScalers, three StoreFront servers, and three Delivery Controllers: one at each datacenter

B.
Two NetScalers, two StoreFront servers, and two Delivery Controllers in the London datacenter

C.
Six NetScalers, six StoreFront servers, and six Delivery Controllers: two at each datacenter

D.
Two NetScalers in the London datacenter and two StoreFront servers and Delivery Controllers in each datacenter.