Refer to the exhibit.The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem？（）

• A、Ensure that the Ethernet encapsulations match on the interconnected router and switch ports.
• B、Ensure that cables A and B are straight-through cables.
• C、Ensure cable A is plugged into a trunk port.
• D、Ensure the switch has power.
• E、Reboot all of the devices.
• F、Reseat all cables.