Select the correct statement with respect to slabs:
1
The maximum ratio of span to depth of a slab simply supported for mild steel and spanning in two directions is 35.
2
In case of mild steel bars, the reinforcement in either direction in slabs shall not be less than 0.12 per cent of the total cross-sectional area.
3
The maximum diameter of reinforcing bars limits to one fourth of the total thickness of the slab.
4
When the ratio of the long to short dimension of the slab is greater than 2, the slab shall be designed as two-way slab.