- 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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Sometimes the walk to the doctors is a better cure than the medicine you receive

-Benny Bellamacina
Philosophical Uplifting Quotes and Poems