What is the purpose of using a "rectangular window" in spectral analysis?

A) To enhance frequency resolution

B) To reduce leakage

C) To simplify computations

D) To obtain a high signal-to-noise ratio

Answer: B) To reduce leakage

Explanation: A rectangular window can cause significant spectral leakage, but it's often used for simplicity in computations. Other window types are preferred to reduce leakage effects, but the rectangular window serves as a basic reference.