The company has a legacy managed switch, and you need to make an update to settings on the switch. You can make the changes using:

a$.$ None of the options are correct

b$.$ a connection to the switch using port $3389$

c$.$ the "telnet $192\mathrm{.}68\mathrm{.}111$:$25"$ command

d$.$ a connection to the RDP port

e$.$ the "sudo open $192\mathrm{.}168\mathrm{.}111\mathrm{.}1"$ command