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What is the total number of quantization errors in the computation of single point DFT of a sequence of length N?

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What is the total number of quantization errors in the computation of single point DFT of a sequence of length N?

(a) 2N

(b) 4N

(c) 8N

(d) 12N

I got this question at a job interview.

My question comes from Quantization Effects in the Computation of DFT in division DFT Efficient Computation – Fast Fourier Transform Algorithms of Digital Signal Processing

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Right answer is (b) 4N

Easy explanation: Since the computation of single point DFT of a sequence of length N involves N number of complex multiplications, it contains 4N number of quantization errors.

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