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What is the auto-correlation function of a signal (t) at t0=0?

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What is the auto-correlation function of a signal (t) at t0=0?

(a) It is equal to average voltage of the signal

(b) It is equal to average power of the signal

(c) It is equal to zero

(d) It is equal to infinite

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

Query is from FM Receiver in division Receivers & Transducers of Analog Communications

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Right option is (b) It is equal to average power of the signal

The explanation: Auto-correlation function is also known as serial-correlation. It is the correlation of a function with a delayed copy of itself. So it is non-unique description of signals. For a signal (t) at t0=0, it is equal to the average power of the signal.

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