Read the following statements regarding the z-transform(a) The ROC is a ring or disk in the z-plane centered at the origin(b) The ROC contains all poles(c) If x(n) is a finite duration sequence, then the ROC is the entire z-plane except possibly z = 0 or z = ∞(d) If x(n) is a right-sided sequence, ROC extends inward from the innermost non-zero poles in x(z) to z = 0Which of the above statements are correct?

• A. (a) and (b)
• B. (b) and (c)
• C. (a) and (d)
• D. (a) and (c)