Click the Exhibit button. As shown in the exhibit， a customer has several interconnected core rings. They want to create several irtual rings？utilizing their STM-64 backbone （nodes 1， 2， 3， and 4）.  What do you recommend？ （）

• A、 SNCP rings
• B、 MS-SPRing rings
• C、 1：N protection on all core circuits
• D、 dual-ring interconnect with MS-SPRing rings