____ is the primary time standard by which the world regulates clocks and time.

Coordinated Universal Time

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Central Daylight Time

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Pacific Daylight Time

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Eastern Daylight Time

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Solution

The correct option is A Coordinated Universal Time
Coordinated Universal Time (or UTC) is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude, and is not adjusted for daylight saving time. It is effectively a successor to Greenwich Mean Time.

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