Elance Exams Answers PDF file

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How can you add a new method foo to an existing class Bar?

Define a C function foo and then send Bar the extend:withSelector: message, e.g. [Bar extend: foo withSelector: @selector(foo:)].
Both "extend" options are correct.
Make a category, e.g. @interface Bar(Foo).
It's not possible.
Send Bar the "extend:" message, e.g. [Bar extend: foo].
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