If a random sample of size n is drawn without replacement from a finite population of size N ,the correction factor for standard error of sample mean is:

A

$$\frac{N-n}{N-1}$$

B

$$\sqrt{\frac{N-n}{N-1}}$$

C

$$\frac{N-1}{N-n}$$

D

$$\sqrt{\frac{N-1}{N-n}}$$