Which of the following is not a unit of time?

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(D) The $Microsecond$ is a unit of time $(10^{-6} \ s)$.The $Leap \ year$ is a unit of time used in calendars.The $Lunar \ month$ is a unit of time ba

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Parallactic second

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(D) The $Microsecond$ is a unit of time $(10^{-6} \ s)$.The $Leap \ year$ is a unit of time used in calendars.The $Lunar \ month$ is a unit of time based on the moon's cycle.The $Parallactic \ second$ (or $parsec$) is a unit of distance used in astronomy to measure large distances to stars and galaxies.Therefore,the $Parallactic \ second$ is not a unit of time.Correct option is $D$.

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