Which of the following interchanges of numbers and mathematical signs would make the given equation correct?
$$729 \times 81 \div 20 + 16 − 6 = 50$$

A

6 and 20, $$\times$$ and $$\div$$

B

20 and 50,$$+$$ and $$−$$

C

16 and 50,$$\times$$ and $$+$$

D

16 and 20,$$+$$ and $$\div$$