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What is the width of the main lobe of the frequency response of a rectangular window of length M-1?

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What is the width of the main lobe of the frequency response of a rectangular window of length M-1?

(a) π/M

(b) 2π/M

(c) 4π/M

(d) 8π/M

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The question is from Design of Linear Phase FIR Filters Using Windows in portion Digital Filters Design of Digital Signal Processing

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Right choice is (c) 4π/M

Easiest explanation: The width of the main lobe width is measured to the first zero of W(ω)) is 4π/M.

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