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Which of these keywords is used to upper bound a wildcard?

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Which of these keywords is used to upper bound a wildcard? (a) stop (b) bound (c) extends (d) implements The question was asked in an online interview. I'm obligated to ask this question of Wildcards topic in chapter Generics of Java Select the correct answer from above options JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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Correct option is (c) extends The best I can explain: None.

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