Which of the following are models for perpendicular lines-

(a) The adjacent edges of a table top.

(b) The lines of a railway track.

(c) The line segments forming the letter ‘L’.

(d) The letter V.

(a) The adjacent edges of a table top are perpendicular to each-other.

(b) The lines of a railway track are parallel to each-other.

(c) The line segments forming the letter ‘L’ are perpendicular to each-other.

(d) It forms an acute angle as its sides are inclined at a point.