JEE Main 2021 Mathematics question

Let C be the locus of the mirror image of a point on the parabola with respect to the line y = x. Then the equation of tangent to C at P(2, 1) is:

• (A)x – y = 1Correct
• (B)2x + y = 5
• (C)x + 3y = 5
• (D)x + 2y = 4