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  1. If we have an object r and want to know if it is a Range object, we can write:

    2. A.

     r typeof Range
    B.

     r is Range
    C.

     r equals Range
    D.

     r instanceof Range

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    Answer : Option D

    Explanation :

    The r instanceof Range returns true if r inherits from Range.prototype. The instanceof operatory does not actually check whether r was initialized by the Range constructor.

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