When the network administrator tries to access the internal network devices through telnet, found it impossible to access. Which of the following is least likely reason?

 When the network administrator tries to access the internal network devices through telnet, found it impossible to access. Which of the following is least likely reason?
A . The route is unreachable, and the client and server cannot establish a TCP connection
B .  The number of users logging in to the device has reached the upper limit
C .  ACL is bound to the VTY user interface
D . VTP user interface is configured with protocol inbound all

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Answer: D