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单选题
Which one of the following statements about the TNSPING utility is correct？（）
A
It helps you to determine whether or not the Oracle database is running.
B
It requires the username and password to check the connectivity of the service.
C
It does not require the username and password to check the connectivity of the service.
D
It establishes a session with the database and checks the connectivity of the service.
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V$UNDOSTATC
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SYSTEM B
OUTLN C
INTERNAL D
SYS
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