Explain the following: (i) Let (ii) Foot fault

(i) Let: a service or rally that is replayed without any change in the score, when the ball touches the net cord and falls in the correct service court, or when the play is interrupted by something outside. (ii) Foot fault: a fault of service, committed when the server touches the baseline or the court with the foot, or walks or runs, or touches the extension of the centre mark or sideline, before striking the ball.