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

A. line

B. path

C. circuit

D. section

E. segment

Section, line, and path errors occur over different spans of the SONET network and between different pieces of equipment.

References: http://www.juniper.net/documentation/en_US/junos15.1/topics/topic-map/sonet-interfaces-alarms-and-errors.html