G"1.6. for a periodic continuous-time signal, parseval’s relationship states that 1 t ∫ || t = ∑ | | +[infinity] 2 =−[infinity] . if the period of is t = 2 and there are two non-zero fourier series coefficients −1 = −1 and = 2 , then ∫ || 1 −1 = ( ) a. 1 b. 3 c.5 d. 10"