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Which of the following is the SI unit of luminous intensity?

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Which of the following is the SI unit of luminous intensity?

(a) Sterdian

(b) Radian

(c) Mole

(d) Candela

The question was asked in exam.

Origin of the question is Laws Governing Gravity in portion Laws of Motion of Engineering Physics I

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Best answer
Correct choice is (d) Candela

Best explanation: Candela is the SI unit of luminous intensity. One candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540×10^12 hertz and that has a radiant intensity of 1/683 watt per sterdian in that direction.

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