Which two numbers, from amongst the given options, should be interchanged to make the given equation correct?
$$(6)^{2} - 20 + (28 \div 7) - [(\sqrt{4}) \times 8] + (2)^{2} = 40$$

A

6 and 8

B

7 and 2

C

2 and 8

D

20 and 8