Which of the following is the correct next step in physically installing a router after the LAN cables are connected to LAN ports when using an external CSU/DSU?
◦ Connect the router's serial interface to the CSU/DSU and the CSU/DSU line from the telco.
◦ Connect the router's serial interface to the line from telco.
◦ Connect the router's console port to a PC to configure the router.
◦ Connect a power cable from a power outlet to the power port on the router.