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What is the purpose of the property PerformanceTiming.navigationStart?

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What is the purpose of the property PerformanceTiming.navigationStart?

(a) Ready to end the navigation

(b) Ready to jump the navigation

(c) Ready for navigation

(d) Ready to changing the navigation

The question was posed to me during an online exam.

Question is from Integrating the Performance Object with perfLogger topic in chapter Invocation and Performance Navigation of JavaScript

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Right answer is (c) Ready for navigation

To explain I would say: The PerformanceTiming.navigationStart read-only property returns an unsigned long long representing the moment, in milliseconds 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.

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