Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Sextant is a modern navigational instrument, which is used for the measurement of vertical and horizontal angles at sea.
Reason (R): It is an instrument of double reflection by means of two mirrors and is capable of measuring angles up to 120\(^\circ\).
In light of the above statements, choose the correct answer from the options given below.