（单选题）
Which one of the following statements about the TNSPING utility is correct？（）
AIt helps you to determine whether or not the Oracle database is running.
BIt requires the username and password to check the connectivity of the service.
CIt does not require the username and password to check the connectivity of the service.
DIt establishes a session with the database and checks the connectivity of the service.
正确答案
答案解析
略
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