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Which of these is an correct way making a list that is upper bounded by class Number?

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Which of these is an correct way making a list that is upper bounded by class Number? (a) List<? extends Number> (b) List (c) List(? extends Number) (d) List(? UpperBounds Number) The question was posed to me at a job interview. My question comes from Wildcards topic in portion Generics of Java Select the correct answer from above options

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Right answer is (a) List<? extends Number> Explanation: None.

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