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Which of the following is used for measuring long time intervals?

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Which of the following is used for measuring long time intervals?

(a) Electrical oscillators

(b) Atomic clocks

(c) Decay of elementary particles

(d) Radioactive dating

I had been asked this question in an interview.

This interesting question is from Dimensions of a Physical Quantity in section Advanced Engineering Materials of Engineering Physics II

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Right answer is (d) Radioactive dating

Best explanation: Radioactive dating is used to measure long time intervals by finding the ratio of the number of radioactive atoms that have undergone decay to the number of atoms left undecayed. Carbon dating is used to estimate the age of fossils, uranium dating is used to estimate the age of rocks.

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