Which of the following commands will change all CR-LF pairs in an imported text file， userlist.txt， to Linux standard LF characters and store it as newlist.txt？（）

A、 tr ’/r/n’  < userlist.txt > newlist.txt

B、 tr -c ’/n/r’  < newlist.txt > userlist.txt

C、 tr -d /r¯ < userlist.txt > newlist.txt

D、 tr /r¯/n¯ userlist.txt newlist.txt

E、 tr -s ®^M’¡®^J’ userlist.txt newlist.tx