Calculate the gradient of the function f(x, y) = cos (4z² – 4y) O a.-8z sin (4x2 4y)i + 4 sin (4x2 – 4y)j O b. 8r sin (4r2 – 4y)i - 4 sin (4x² - 4y)j O c. - sin (4x2 = 4y)i + sin (4x² – 4y)j O d. sin (4x2- 4y)i – sin (4x? – 4y)j

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A: The given gradient function

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