What type of couplers connect LC connectors to extend the length of a cable run?

The correct choice is LC couplers, which specifically connect LC connectors to extend the length of a cable run. LC connectors are compact and designed for high-density applications, making them a prevalent choice in modern networking environments. Using an LC coupler allows for a seamless connection between two LC-terminated fibers, ensuring minimal loss and optimal performance for high-speed data transmission.

Other types of couplers such as ST, SC, and MTP are designed for different connector types and would not be compatible with LC connectors, which is essential for maintaining the integrity and quality of the fiber optic link. Having the proper coupler is crucial for ensuring that the installation remains efficient and effective, preserving the appropriate alignment and connection characteristics that LC connectors are known for.