Find the gradient field F of the function f.f(x, y, z) = x6y7 + 
A. F = (6x5 + 5x4)i + 7y6j + 
k
B. F = 6x5y7i + 7x6y6j - 
k
C. F = (6x5 + 5x4)i + 7y6j - 
k
D. F = 
i + 7x6y6j - 
k
Answer: D
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