When is the Demo object eligible for garbage collection?

(a) After line 5

(b) After line 6

(c) After the start() method completes

(d) When the instance running this code is made eligible for garbage collection.

class Test { private Demo d; void start () { d } } new Demo (); this.take Demo (d); /* Line 5 */ } /* Line 6 */ void take Demo (Demo demo) { demo null; demo = new Demo ();