The partial derivative of the function\(f\left( {x,\;y,\;z} \right) = {e^{1 - x\cos y}} + xz{e^{ - 1/\left( {1 + {y^2}} \right)}}\)With respect to x at the point (1, 0, e) is

• A. -1
• B. 0
• C. 1
• D. \(\frac{1}{e}\)