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 customer has 2 E1s to add between far-end nodes in an SNCP ring. 
What type of circuit should you recommend？ （）