单选题Which code causes only a Level 2 adjacency to be formed under the SONET interface so-2/2/2 with Frame Relay encapsulation？（）Aso-2/2/2 { unit0 { disable familyiso }}Bisis{ level1 disable； interfaceso-2/2/2.0 { disable } interfaceall；Cso-2/2/2 { unit0 { disablelevel 1； familyiso }}Disis{ level1 disable； interfaceall； }
单选题
Which code causes only a Level 2 adjacency to be formed under the SONET interface so-2/2/2 with Frame Relay encapsulation？（）
A
so-2/2/2 { unit0 { disable familyiso }}
B
isis{ level1 disable； interfaceso-2/2/2.0 { disable } interfaceall；
C
so-2/2/2 { unit0 { disablelevel 1； familyiso }}
D
isis{ level1 disable； interfaceall； }
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