Choose the one alternative that best completes the statement or answers the question. -The current definition of the standard second of time is based on

Choose the one alternative that best completes the statement or answers the question.
-The current definition of the standard second of time is based on
A) the frequency of radiation emitted by cesium atoms.
B) the oscillation of a particular pendulum kept in France.
C) the duration of one year.
D) the earth’s rotation rate.

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