RIP的管理距离（Administrative Distance）是（）

A、90

B、100

C、110

D、120

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  B

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  C

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  D

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  E

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  C、<%-- this is a comment --%>

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• View the Exhibit and examine the structure of the EMP table. You executed the following command to add a primary key to the EMP table：   ALTER TABLE emp   ADD CONSTRAINT emp_id_pk  PRIMARY KEY （emp_id）   USING INDEX emp_id_idx；   Which statement is true regarding the effect of the command？（）

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  B、  The PRIMARY KEY is created and it would use an existing unique index.

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