Which of the following statements about the Z-transform is true?

A) It is only applicable to continuous-time signals.

B) It transforms signals from the time domain to the frequency domain.

C) It is a tool for analyzing linear discrete-time systems.

D) It requires a finite number of inputs.

Answer: C) It is a tool for analyzing linear discrete-time systems.

Explanation: The Z-transform is used primarily for analyzing and designing linear discrete-time systems, providing a way to work with signals in the complex frequency domain.