Correct Answer - Option 2 : 0.12% of the total cross-sectional area
Explanation
As per IS 456:2000, the limit on minimum reinforcement along either direction has been specified.
In the case of mild steel, minimum reinforcement along either direction shall not be less than 0.15% of the total cross-sectional area of the slab (bD).
In the case of HYSD bars, minimum reinforcement along either direction shall not be less than 0.12% of the total cross-sectional area of the slab (bD).
Also, the maximum diameter of reinforcing bars shall not exceed one-eighth the total thickness of the slab.