Which of the mathematical signs should be interchanged in the below equation to make it mathematically correct?
$$72 - 6 + 2 \times 216 \div 24 = 420$$

A

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

B

$$-$$ and $$\times$$

C

$$-$$ and $$+$$

D

$$-$$ and $$\div$$