The maximum compressive strain according to limit stage design as per IS 456, at the highly compressed extreme fibre in concrete subjected to axial compression and bending and when there is no tension on the section shall be
1. 0.002
2. 0.0035
3. 0.002 - 0.75ext, eext is the strain at the least compressed fibre
4. 0.0035 - 0.7eext
5. 0.0002