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  1. Which of these methods can be used to obtain set of all keys in a map?
    2. A.
    getAll()
    B.
    getKeys()
    C.
    keyall()
    D.
    keySet()

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    Answer : Option D

    Explanation :

    keySet() methods is used to get a set containing all the keys used in a map. This method provides set view of the keys in the invoking map.

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