①$$3\times 4\times 3\times 2\times 1=72$$ ,  ②$$2\times 4\times 3\times 2\times 1=48$$ . 
Four students asked their teacher, Mr. Carter, to line up with them to take a picture.  ①If Mr. Carter does not want to stand on an end, how many different ways can they line up for the picture?  ②If Mr. Carter insists on standing on an end, how many different ways can they line up for the picture? 
[A] $72$ , $24$ 
[B] $96$ , $24$ 
[C] $72$ , $48$ 
[D] $96$ , $48$ 