Find the gradient field F of the function f.f(x, y, z) = 
8
A. F = 8
7i + 
j + 8
k
B. F = 8
7i + 
j + 8
k
C. F = 8
7i + 
j - 8
k
D. F = 
i + 
j - 8
k
Answer: D
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