If a force is applied to a plastic substance, then I. they have no gross tendency to regain thei...

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If a force is applied to a plastic substance, then
I. they have no gross tendency to regain their original shape.
II. permanently deformed.
IIl. they have tendency to regain their original shape.
IV. not permanently deformed.
Which of the following statement(s) is/are correct?
(a) Only I
(b) Both I and II
(c) Only III
(d) Both III and IV
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