Given $f(x) = e^{\sin x} + e^{\cos x}$. The global maximum value of $f(x)$

  • A
    does not exist
  • B
    exists at a point in $\left(0, \frac{\pi}{2}\right)$ and its value is $2 e^{\frac{1}{\sqrt{2}}}$
  • C
    exists at infinitely many points
  • D
    exists at $x=0$ only

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