If You Want to Examine an Input Value Without Actually

If you want to examine an input value without actually removing it from the input stream,you can apply a member function of cin to the variable ch,which you are to assume is a char type variable.Which of these does this task?

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