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