Assertion (A): Plastic deformation in metals andalloys is a permanent deformation under load….

Assertion (A): Plastic deformation in metals andalloys is a permanent deformation under load. Thisproperty is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation inmetal or alloy is caused by movement or dislocations.(a) Both A and R are individually true and R is the correctexplanation of A(b) Both A and R are individually true but R is not thecorrect explanation of A(c) A is true but R is false(d) A is false but R is true