For which of the following requirements can you implement a functional method? There are 2 correct answers to this question.

For which of the following requirements can you implement a functional method? There are 2 correct answers to this question.
A . A handler method for an event that has a returning parameter
B . A factory method that returns an object reference
C . A method to set an instance attribute with one importing parameter and no other parameters
D . A private static helper method that returns a single value as the result of an algorithm

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Answer: B,D