A customer wants to create a 1:1 protection group with a DS3N-12 card. Which card slots would allow for a 1:1 protection?（）

Click the Exhibit button. Which type of protection is shown in the exhibit?（）

A.1+0
B.1+1
C.1：1
D.1：N

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You are provisioning a DS-1 circuit on an ONS 15454 UPSR configuration and XC-10G card. How many total VT ports are used within the VT matrix at the source node?（）

A.0
B.1
C.2
D.3
E.4

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