Which of the following is a proper implementation for a method that displays the contents of a List? (a)

public void Di splayRos t e r ( Li s t r o s t e r ) { I t e r a t o r i t e r = r o s t e r . i t e r a t o r ( ) ; while ( i t e r . hasNext ( ) ) System . out . p r i n t l n ( i t e r . next ( ) ) ; } public void Di splayRos t e r ( Li s t r o s t e r ) { I t e r a t o r i t e r = r o s t e r . i t e r a t o r ( ) ; while ( i t e r . Next ( ) != nul l ) System . out . p r i n t l n ( i t e r . next ( ) ) ; } (b)

public void Di splayRos t e r ( Li s t r o s t e r ) { I t e r a t o r i t e r = r o s t e r . i t e r a t o r ( ) ; while ( i t e r . hasNext ( ) ) System . out . p r i n t l n ( i t e r . getNext ( ) ) ; } public void Di splayRos t e r ( Li s t r o s t e r ) { I t e r a t o r i t e r = r o s t e r . g e t I t e r a t o r ( ) ; while ( i t e r . hasNext ( ) ) System . out . p r i n t l n ( i t e r . next ( ) ) ; }