When the network administrator tried to access the internal network device through Telnet, he found that he could not access it. Which of the following reasons is impossible?

When the network administrator tried to access the internal network device through Telnet, he found that he could not access it. Which of the following reasons is impossible?
A . The route is unreachable and the client and server cannot establish a TCP connection.
B . ACL is bound in the VTY user interface
C . Protocol inbound all is configured in the VTY user interface.
D . The number of users logged into the device has reached the upper limit.

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Answer: C