If $$I_k = \left\{x \epsilon R: 0 < x < \frac{1}{k}\right\}$$ for k = 1, 2, 3, ....... then $$\bigcap_{k=1}^{\infty}I_k = $$

A

$$\left\{0\right\}$$

B

$$\phi$$

C

$$\left\{1\right\}$$

D

$$\left\{x \epsilon R : 0 < x < 1\right\}$$