What option is commonly available on most optical nodes for connecting to the power supply?

The option that indicates connecting the power cable directly to the node's power port is correct because optical nodes require a reliable and consistent power supply to function effectively. These nodes typically come with designated power ports that allow for a straightforward and secure connection of the power cable. This direct connection ensures that the node receives the necessary electrical current to operate its functions, such as signal amplification and data processing.

The design of optical nodes is such that they are not intended for wireless power connections, as the stability and reliability of a wired connection are crucial for their operation. Hardwiring directly to the main grid may not be feasible or safe for every node location, and using solar power can be an option but is often not the primary method for powering optical nodes. Thus, connecting the power cable to the node's power port remains the most common and practical method for supplying power to these devices, ensuring they function properly in delivering fiber optic services.