Which of the following is a read-only property?

Which of the following is a read-only property? Correct Answer PerformanceTiming.navigationStart & PerformanceTiming.fetchStart

PerformanceTiming.navigationStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, right after the prompt for unload terminates on the previous document in the same browsing context. If there is no previous document, this value will be the same as PerformanceTiming.fetchStart. Both PerformanceTiming.navigationStart and also the PerformanceTiming.fetchStart are a read-only properties.
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