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निम्नलिखित में से कौन सा विकल्प इस पाठ को पूरा करता है ताकि यह मानक अंग्रेजी के व्याकरण नियमों के अनुकूल हो? As British scientist Peter Whibberley has observed, 'the Earth is not a very good timekeeper.' Earth's slightly irregular rotation rate means that measurements of time must be periodically adjusted. Specifically, an extra 'leap second' (the 86,401st second of the day) is ______ time based on the planet's rotation lags a full nine-tenths of a second behind time kept by precise atomic clocks.