The HCF of $$\frac{3}{4}, \frac{5}{7}, \frac{7}{9}$$ and $$\frac{1}{12}$$ will be:

A

$$\frac{1}{252}$$

B

$$\frac{1}{63}$$

C

$$\frac{1}{126}$$

D

$$\frac{1}{378}$$