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Which of the following is not correct about wavelength standard?

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Which of the following is not correct about wavelength standard?

(a) Wavelength of monochromatic light is an invariable unit of length

(b) Wavelength standard is a physical standard

(c) It is a reproducible standard

(d) It is a natural unit of length

The question was posed to me in an interview for internship.

This interesting question is from Wavelength Standard topic in chapter Standards of Measurements of Engineering Metrology

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The correct choice is (b) Wavelength standard is a physical standard

The best explanation: Wavelength standard need not be preserved as it is not a physical one. This is an advantage of wavelength standard over others.

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