Pick up the correct statement from the following :

• in the earth's magnetic field, a magnetic needle rests in magnetic meridian
• the angle between the true meridian and the magnetic meridian is called magnetic variation
• one end of the magnetic needle supported at its centre of gravity tends to dip down towards the. nearer magnetic pole of the earth
• the magnet properly pivoted is balanced by means of riding weight movable along the needle
• all the above.