Which of the mathematical signs should be interchanged in the below equation to make it mathematically correct?
$$15 ÷ 5 \times 27 + 3 - 9 = 51$$

A

$$+$$ and $$\times$$

B

$$\div$$ and $$+$$

C

$$\div$$ and $$\times$$

D

$$+$$ and $$-$$