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  1. Which of the following is a read-only property?

    2. A.

     PerformanceTiming.navigationStart
    B.

     PerformanceTiming.fetchStart
    C.

     PerformanceTiming.navigationStart & PerformanceTiming.fetchStart
    D.

     None of the mentioned

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    Answer : Option C

    Explanation :

    Both PerformanceTiming.navigationStart and also the PerformanceTiming.fetchStart are a read-only properties.

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