Find the locus of point equidistant from two straight lines y

Find the locus of point equidistant from two straight lines y – 5 = 0 and y – 3 = 0

The correct answer is: B

Locus of point P equidistant from y - 5 = 0 and y - 3 = 0 is y = 4 i.e y - 4 = 0