An employee informs the help desk the laptop they are using cannot update the login credentials when they plug it in to the company's wired network. Wireless connectivity is fine, but the login credentials cannot be updated using W$/1-$Fi$.$ What is a possible action the help desk could take to troubleshoot the problem?

a$.$ Use a USB to RU$-45$ dongle

b$.$ Replace the network card

c$.$ Ping the loopback address

d$.$ Use a loopback plug