Which of the following offers the highest level of redundancy in the design of a storage system？（）

• A、 A Dual Port HBA with a pair of Point-To-Point connections to the SAN.
• B、 Two Single Port HBAs connected to a fiber switch.
• C、 A Dual Port HBA with a Point-To-Point connection to a SAN.
• D、 Two Dual Port HBAs connected to a pair of fiber switches.