In the first part of the video, Freddie wasposed the problem of having 400 baseballcards and selling 150 cards, and asked howmany cards he had left. He used a standardalgorithm to set up the problem and solve.Freddie explained his work in the followingsteps.(i) zero minus zero is zero(ii) zero minus five is five(iii) four minus one is threeWhich step is incorrect in Freddie's work?(iii)(ii)(i)None, the solution is correct