In Image Averaging enhancement method assumptions are made for a noisy image g(x, y). What is/are those?

In Image Averaging enhancement method assumptions are made for a noisy image g(x, y). What is/are those? Correct Answer None of the mentioned

In Image Averaging enhancement method assumptions are made for a noisy image g(x, y) that at every coordinate (x, y) the noise has 0 average value and must be uncorrelated.
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