If You Have Already Removed a Character (In Char Variable

Multiple Choice

If you have already removed a character (in char variable ch) from the input stream,you can apply a member function of cin to the variable ch to return it to the input stream.Which of these does this task?

A) cin.get(ch) ;
B) cin.put(ch) ;
C) cin.peek(ch) ;
D) cin.putback(ch) ;