The question consists of two statements, namely, Assertion (A) and Reason (R). Choose the correct option.

Assertion (A)	Reason (R)
X = 3 is a line parallel to y-axis.	Any line parallel to y-axis is y = k, where k ∈ R.

We know that the equation of y-axis is x = 0 and the equation of any line parallel to y axis is x = a, therefore, the reason is true.

Also, by the reason x = 3 is a line parallel to y-axis, therefore, the assertion is true.

Hence, both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).