A computer is unable to access the network. When you check the LED $($Light$-$Emitting Diode$)$ lights near the computer$$s network port, you discover the lights are not lit. Which layer of the OSI $($Open Systems Interconnection$)$ model will you use to troubleshoot this problem?

a$.$

Application Layer

b$.$

Physical Layer

c$.$

Session Layer

d$.$

Data Link layer