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# When hard steel is heated to bright redness and then allowed to cool slowly, it gets softened. The process is called

$(a)\;\text{Hardening} \\(b)\;\text{Tempering } \\(c)\;\text{Quenching } \\ (d)\;\text{Annealing}$

When hard steel is heated to bright redness and then allowed to cool slowly, it gets softened. The process is called Annealing.
Hence d is the correct answer.