Creep can be described as a process of the slow rise of plastic deformation under the action of shear stresses when it is below the yield strength of the material. Hence, Option C is correct.
What do you mean by permanent deformation?
Permanent deformation can be defined as irreversible, the deformation remains even after the elimination of the carried out forces, at the same time as the transient deformation is recoverable because it disappears after the elimination of carried out forces.
therefore, the correct statement is Option C.
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