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Which of the following case hardening processes, result in a change in the composition in a steel component?

(1) Carburizing   (2) Cyaniding

(3) Nitriding       (4) Flame hardening

(a) 2, 3 and 4 only           (b) 1, 3 and 4 only

(c) 1, 2 and 3 only           (d) 1, 2, 3 and 4

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