Correct answer choice is:
D. Frequency.
Explanation:
AC frequency is the number of periods per moment in an alternating current (ac) sine wave. Said different mode, the frequency is the scale at which the current varies course per instant. It is estimated in hertz (Hz), a global unit of measure wherever 1 hertz is equivalent to 1 cycle per instant.
On a sense of worry, loneliness, and sometimes also depression.
Hope this helped
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Any of those answers are fine.
