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Each option lists a different combination of the companies mentioned in the question.
Option 1 states that Voltas and Titan Industries are part of the Tata Group. Option 2 suggests that Titan Industries, Rallis India, and Indian Hotels are Tata Group companies. Option 3 says that Voltas, Rallis India, and Indian Hotels are part of the Tata Group.
However, these options are incorrect as they do not include all the mentioned companies that are a part of the Tata Group.
The correct answer is option 4 because all these companies, Voltas, Titan Industries, Rallis India, and Indian Hotels, are part of the Tata Group – a multinational conglomerate holding company headquartered in Mumbai, India. Tata Group has various sectors of businesses, including consumer goods, services, chemicals, and hospitality, which these companies belong to.