In the following question, which one of the four interchanges in signs and numbers would make the given equation correct?7 $$\div$$ 2 - 4 + 1 = 6

A

÷ and + ; 2 and 7

B

- and + ; 2 and 1

C

÷ and - ; 2 and 4

D

÷ and + ; 7 and 4