Find the greatest among these fractions.
$$\frac{5}{11}, \frac{3}{15}, \frac{12}{11}, \frac{4}{7}, \frac{9}{12}$$

A

$$\frac{12}{11}$$

B

$$\frac{4}{7}$$

C

$$\frac{9}{12}$$

D

$$\frac{3}{15}$$