[单选] 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.

话剧《（）》的诞生，标志着中国话剧正式步入“剧场戏剧”时期，是中国话剧从业余化走向专业化的标志。人格解组与社会解组的联系以及区别。 What method in a Cisco IOS router can confirm that packets marked for a particular QoS marking are being matched?（） Issue a show policy-map interface command. 。 Assuming Netflow is enabled, issue a show ip cache verbose flow command.。 Issue a show crypto ipsec session command.。 Issue a debug qos set command and a terminal monitor command.。（）是“启蒙文学”的先驱，鲁迅、郭沫若、茅盾等作家可以看作其主要代表。花鸟画中的“徐黄异体”各有什么特点？ Which one of the following statements about the TNSPING utility is correct？（）

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[单选] Which one of the following statements about the TNSPING utility is correct？（）

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