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What is the hardness of a rhodium plate?

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What is the hardness of a rhodium plate?

(a) 140-425 Vickers

(b) 540-640 Vickers

(c) 720-880 Vickers

(d) 950-1050 Vickers

I had been asked this question in an interview for internship.

The query is from Mechanical Tests on Metals, Protection Against Wear topic in section Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

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Right choice is (b) 540-640 Vickers

For explanation I would say: The hardness of rhodium plate is between 540 and 640 Vickers and it has a wear resistance between that of nickel plate and chromium plate. The hardness of chromium plate is 950-1050 Vickers, whereas that of nickel plate is 140-425 Vickers.

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