For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is

For the construction of R.C.C. slabs, columns, beams, walls, etc. the

1.	For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is
A.	1 : 3 : 6
B.	1 : 1Â½ : 3
C.	1 : 2 : 4
D.	1 : 1 : 2
Answer» D. 1 : 1 : 2