In retaining and breast walls, weep holes are provided at
(A) 50 cm vertical height and 50 cm centre to centre horizontally
(B) 100 cm vertical height and 100 cm centre to centre horizontally
(C) 100 cm vertical height and 120 cm centre to centre horizontally
(D) 120 cm vertical height and 100 cm centre to centre horizontally
(A) 50 cm vertical height and 50 cm centre to centre horizontally
(B) 100 cm vertical height and 100 cm centre to centre horizontally
(C) 100 cm vertical height and 120 cm centre to centre horizontally
(D) 120 cm vertical height and 100 cm centre to centre horizontally