Which three SONET network elements are used for troubleshooting? (Choose three.)

The line layer manages synchronous multiplexing and de-multiplexing of lower-order paths and includes overhead bytes for error monitoring and alarm signaling across a single fiber span.

The path layer is responsible for end-to-end signal transport between path terminating equipment, providing overhead bytes for error checking and status monitoring of the entire service.

"Circuit" is a general term for a communication channel and is not a specific, distinct layer or element in the SONET hierarchy used for troubleshooting like section, line, and path.

The section layer handles the transport of optical signals between adjacent SONET equipment, including repeaters or regenerators, with overhead bytes providing local fault detection and performance monitoring.

"Segment" is not a standard, distinct layer or element in the SONET hierarchy similar to section, line, or path, which have specific overhead bytes for monitoring and troubleshooting.