What is the Z-transform primarily used for in DSP?

A) Analyzing continuous-time signals

B) Designing analog filters

C) Analyzing and designing discrete-time systems

D) Sampling continuous signals

Answer: C) Analyzing and designing discrete-time systems

Explanation: The Z-transform is a mathematical tool used to analyze and design discrete-time systems. It provides a way to work with signals and systems in the frequency domain, similar to the Laplace transform for continuous systems.