The Z-Transform X(z) of a discrete time signal x(n) is defined as ____________

• A. \(\sum_{n=-\infty}^{\infty}x(n)z^n\)
• B. \(\sum_{n=-\infty}^{\infty}x(n)z^{-n}\)
• C. \(\sum_{n=0}^{\infty}x(n)z^n\)
• D. None of the mentioned