Tiered disk systems （DS8700 and DS5020）， tape backup and Cisco director（s） utilizing VSANs have been proposed as a solution. The storage specialist is asked to explain the technical advantage of using Cisco directors and VSANs.  Which of the following is the key point to stress to the customer（）

A、a single director and VSANs provides redundant fabrics at reasonable cost

B、prevent disk and tape traffic from sharing a host port

C、ease of implementation of Administrative Domains

D、ability to easily create a DS8700 LPAR to send data directly to tape