$$9 \div \left[5 +7 \div \left\{9 + 9 \div \left(9 + 9 \div 4\right)\right\}\right]$$ = ?

A

$$\frac{48}{40}$$

B

$$\frac{63}{40}$$

C

$$\frac{59}{40}$$

D

$$\frac{37}{40}$$