Stress strain curve of high tensile steel

A Has a definite yield point
B Does not show definite yield point but yield point is defined by 0.1% proof stress
C Does not show definite yield point but yield point is defined by 0.2% proof stress
D Does not show definite yield point but yield point is defined by 2% proof stress

Correct Answer: Does not show definite yield point but yield point is defined by 0.2% proof stress

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