The function $$f'(x)$$ is

A

increasing in $$\left(-t, -\frac{1}{4}\right)$$ and decreasing in $$\left(-\frac{1}{4}, t\right)$$

B

decreasing in $$\left(-t, -\frac{1}{4}\right)$$ and increasing in $$\left(-\frac{1}{4}, t\right)$$

C

increasing in (-t, t)

D

decreasing in (-t, t)