According to IS 456:2000, for limit state method of collapse in flexure, which of the following assumptions is correct?

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According to IS 456:2000, for limit state method of collapse in flexure, which of the following assumptions is correct?.

1. Plane section normal to axis does not remain plane after bending.
2. The relationship between the stress strain distribution in concrete is assumed to be
straight.
3. The tensile strength of the concrete is taken into account.
4. The maximum strain in concrete at the outermost compression fibre is taken as
0.0035 in bending.            (Ans)