Final answer:
The correct answer is that the given expression is a representation of Parseval's theorem, indicating the equivalency of energy in the time domain and the Fourier domain, hence the power of a periodic signal can be evaluated in the Fourier domain.
Step-by-step explanation:
The expression given is a fundamental relation in signal processing known as Parseval's theorem, which states that the total energy of Fourier coefficients of a signal in the frequency domain is equal to the energy of the corresponding signal in the time domain. This concept is vital when working with the Fourier series representation of a periodic signal, where the energy of the signal can be expressed as the sum of the square of its Fourier coefficients. Therefore, the correct answer to the question is that the integral of the squared modulus of a signal over one period (T₀) is equal to the sum of the squared modulus of its Fourier coefficients over all harmonics, which indicates that the power of periodic signal can be computed from its Fourier series representation, making the statement (b) the correct choice.