A technician is connecting DSL for a new customer. After installing and connecting the on$-$premises equipment, the technician verifies DSLsynchronization. When connecting to a workstation, however, the link LEDs on the workstation and modem do not light up$.$ Which of the followingshould the technician perform during troubleshooting?A$.$ Identify the switching loops between the modem and the workstation.B$.$ Check for asymmetrical routing on the modem.C$.$ Look for a rogue DHCP server on the network.D$.$ Replace the cable connecting the modem and the workstation.