问题：
[单选题]As part of fallover testing of a corporate database server， client application connectivity must be verified. Which of the following would best verify the application functionality？（）
A、 Perform a ping client verification test.
B、 Review the number of active application processes.
C、 Perform successful reads and writes to the application.
D、 Run netstat -an to verify client connections to the listening ports.
参考答案：
C
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