If $f(x)=x^x$, then the interval in which $f(x)$ decrease is
- A$\left[0, \frac{1}{e}\right]$
- B$[0, \mathrm{e}]$
- C$\left[\frac{1}{\theta}, \infty\right]$
- D$\left[0, e^e\right]$
✓ Correct answer: A
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