What role does indium play when added to metal alloys?

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Enhances adhesion propertiesIncreases hardness of metal-ceramic silver-palladium alloysBoth enhances adhesion and increases hardnessDoes not affect the alloyNone of these

Explanation

Indium contributes to metal alloys by both improving the bonding characteristics and increasing the hardness of metal-ceramic silver-palladium alloys, making option C the correct choice.