- Differentiable for any real value of x
- Differentiable for any complex value of x
- May or may not be differentiable for any real value of x
- Differentiable for all positive values of x

Answer: Option 3

Explanation:

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Forever is a really long time, you know? What do you do with forever?""The same thing you do when you don't have forever." He smiled wanly. "Live.

-Amanda Hocking
Wisdom