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What does Stefan-Boltzmann law for radiation pyrometers denote?

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What does Stefan-Boltzmann law for radiation pyrometers denote?

(a) W = KT^4

(b) W = KT

(c) W = KT^-4

(d) W = K/T^4

This question was posed to me in final exam.

Origin of the question is Pyrometry and the Types of Pyrometers topic in division Tools of the Metallurgist of Engineering Material & Metallurgy

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The correct option is (a) W = KT^4

Explanation: The principle of radiation pyrometer is based on a standard radiation body known as a blackbody. By Stefan-Boltzmann law, W = KT^4 expresses the rate of radiation energy as a proportional to the fourth power of absolute temperature. Here W is the rate of energy emitted and K is a constant of proportionality.

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