A user has reported that they cannot access the company FTP site. The user states that they are using the IP address that was given to them “74200.92.105”. Which of the following is MOST likely the problem?（）
- A、Invalid IP address
- B、FTP program is not working
- C、Port 21 is blocked
- D、The FTP site is down
正确答案:A
答案解析:有
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