Which of the following statement(s) is/are correct ?
Options:
(a) The horizontal plane containing the longitude circle and the axis of rotation of the earth is called magnetic meridian.
(b) The angle between the true geographic north and the south shown by a compass needle is called the magnetic declination or simple declination.
(c) The declination is smaller at higher latitudes and greater near the equator.
(d) Dip is the angle that the total magnetic field Be of the earth makes with the surface of the earth.