Your manager asks you to transmit a small file that includes sensitive personnel data to a Linux server on the network. The server is running a Telnet server and an SSH server. Why is it not a good idea to use Telnet to reach the remote computer?

a$.$ SSH is faster than Telnet.

b$.$ SSH running on the same computer as Telnet causes Telnet not to work.

c$.$ Telnet is not reliable, and the file might arrive corrupted.

d$.$ Telnet transmissions are not encrypted.