If $$X_1, X_2, ...... X_n$$ is a simple random sample without replacement of size n from a finite population of N units with mean $$\mu$$ and $$\sigma^2$$, the covariance of $$(X_i, X_j)$$ will be:

A

$$\frac{-\sigma^2}{N - 1}$$

B

$$\frac{\sigma^2}{N - 1}$$

C

$$\frac{\sigma^2}{n - 1}$$

D

$$\frac{-\sigma^2}{n - 1}$$