What is the main advantage of using a phase-locked loop (PLL) in signal processing?

A) It amplifies the input signal

B) It allows for precise frequency synthesis and demodulation

C) It reduces the signal-to-noise ratio

D) It simplifies the design of filters

Answer: B) It allows for precise frequency synthesis and demodulation

Explanation: A phase-locked loop (PLL) is used to generate and stabilize frequencies, making it valuable for tasks such as frequency synthesis, demodulation, and synchronization in communication systems.