If $$' \alpha '$$ denotes $$'-'$$, $$'\beta'$$ denotes $$' \times '$$, $$' \gamma '$$, denotes $$'+'$$, $$' \delta '$$ denotes $$' \div '$$, then $$7 \gamma 8 \alpha 6 \delta 2 \beta (8 \alpha 4) =$$

A

8

B

5

C

3

D

6