3. Scoring a boundary
(a) A boundary shall be scored and signalled by the bowler’s end umpire whenever, while the ball is in play, in his opinion,
(i) the ball touches the boundary, or is grounded beyond the boundary.
(ii) a fielder with some part of his person in contact with the ball, touches the boundary or has some part of his person grounded beyond the boundary.
(iii) the ball, having crossed the boundary in the air, is first touched by a fielder who has not satisfied the conditions in 4(i) below.
(b) The phrases ‘touches the boundary’ and ‘touching the boundary’ shall mean contact with
either (i) the boundary edge as defined in 2 above
or (ii) any person or obstacle within the field of play which has been designated a boundary by the umpires before the toss.
(c) The phrase ‘grounded beyond the boundary’ shall mean contact with
either (i) any part of a line or solid object marking the boundary except the boundary edge
or (ii) the ground beyond the boundary edge
or (iii) any object in contact with the ground beyond the boundary edge.
4. Ball beyond the boundary
After it has crossed the boundary in the air, a ball may be caught, subject to the provisions of Law 32, or fielded provided that
(i) the first contact with the ball is by a fielder, not touching or grounded beyond the boundary, who has some part of his person grounded within the boundary or whose final contact with the ground before touching the ball was entirely within the boundary.