If plain bars are used, the area of distribution reinforcement in slabs should not less than
(a) 0.12% of the gross area f concrete
(b) 0.15% of the gross area of concrete
(c) 0.18% of the gross area of concrete
(d) 0.20% of the gross area of concrete
(a) 0.12% of the gross area f concrete
(b) 0.15% of the gross area of concrete
(c) 0.18% of the gross area of concrete
(d) 0.20% of the gross area of concrete