Which code snippet must be used to retrieve this cookie object?

You need to retrieve the username cookie from an HTTP request. If this cookie does NOT exist,
then the c variable will be null. Which code snippet must be used to retrieve this cookie object?

A.
10. Cookie c = request.getCookie(“username”);

B.
10. Cookie c = null;
11. for ( Iterator i = request.getCookies();
12. i.hasNext(); ) {
13. Cookie o = (Cookie) i.next();
14. if ( o.getName().equals(“username”) ) {
15. c = o;
16. break;
17. }
18. }

C.
10. Cookie c = null;
11. for ( Enumeration e = request.getCookies();
12. e.hasMoreElements(); ) {
13. Cookie o = (Cookie) e.nextElement();
14. if ( o.getName().equals(“username”) ) {
15. c = o;
16. break;
17. }
18. }

D.
10. Cookie c = null;
11. Cookie[] cookies = request.getCookies();
12. for ( int i = 0; i < cookies.length; i++ ) {
13. if ( cookies[i].getName().equals(“username”) ) {
14. c = cookies[i];
15. break;
16. }
17. }

Explanation: