Which one of the following, concerning great circles on a Direct Mercator chart, is correct?

Question

Question ATPL - Airline Transport Pilot license - General Navigation

QuizVDS · Accepted Answer

With the exception of meridians and the equator, they are curves concave to the equator

QuizVDS · Answer

They approximate to straight lines between the standard parallels

QuizVDS · Answer

They are all curves concave to the equator

QuizVDS · Answer

They are all curves convex to the equator

Id 103 - ATPL - Which one of the following, concerning great circles on a Direct Mercator chart, is correct?