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 either ends, how many different ways can they line up for the picture?  ②If Mr. Carter insists on standing on one of the $2$ ends, how many different ways can they line up for the picture? 
选项为:A:$72$ , $24$  B:$96$ , $24$  C:$72$ , $48$  D:$96$ , $48$  请回答其中一个选项.