Correct Answer:

Solution : The correct answer is the plane passing through the Magnetic North and Magentic South of the Earth.

A magnetic meridian is a line on the earth's surface that approximates a large circle and runs across the north and south magnetic poles. It is the irregular imaginary line that circles the earth around the magnetic north and south poles and the magnetic needle at this point align in the magnetic north and south pole directions.

Additional information-

The magnetic equator of the Earth runs through Thumba in South India.