A material behaves in certain ways above and below the proportional limit on a stress strin curve, which of the following is correct______________?

A. Neither A or B

B. Above the proportional limit a material functions in an elastic manner, while below the proportional limit it behaves as an plastic

C. Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic

D. Either A or B

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