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
Answer: D