Find all the first order partial derivatives for the following function.f(x, y, z) = xz
A. 
= z
; 
= - 
; 
= x
B. 
= z
; 
= - 
; 
= x
C. 
= z
; 
= 
; 
= x
D. 
= z
; 
= 
; 
= x
Answer: D
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A. 
B. 
C. 
D. 
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