Assertion: The true geographic north direction can be found by using a compass needle.
Reason: The magnetic meridian of the earth is along the axis of rotation of the earth.
Options:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.