xR and xA are, respectively, the rms and average values of x(t) = x(t - T), and similarly, yR and yA are, respectively, the rms and average values of y(t) = kx(t), k, T are independent of t. Which of the following is true?

• A. \({y_A} = k{x_A}\;;{y_R} = k{x_R}\)
• B. \({y_A} = k{x_A};{y_R} \ne k{x_R}\)
• C. \({y_A} \ne k{x_A};{y_R} = k{x_R}\)
• D. \({y_A} \ne k{x_A};{y_R} \ne k{x_R}\)