Which is NOT a property of the region of convergence?

• ROC is a disconnection region Correct
• A two-sided sequence (neither left nor right-sided) has a ROC consisting of a ring in the z-plane, bounded on the interior and exterior by a pole
• The Fourier transform of x[n] converges absolutely if and only if the ROC of the z-transform includes the unit circle
• The ROC cannot contain any poles