Which statement about meridians is correct?

Question

Question ATPL - Airline Transport Pilot license - General Navigation

QuizVDS · Accepted Answer

A meridian and its anti-meridian form a complete great circle.

QuizVDS · Answer

A meridian is a complete great circle of 360°.

QuizVDS · Answer

The plane of a meridian is parallel to the equator.

QuizVDS · Answer

All meridians are parallel to the Meridian of Greenwich.

Id 311 - ATPL - Which statement about meridians is correct?