Which of the following is observed and corrected by a NTP client?

Which of the following is observed and corrected by a NTP client?

A.
The skew in time between the system clock and the reference clock.

B.
Changes in the time zone of the current computer’s location.

C.
Adjustments needed to support Daylight Saving Time.

D.
The skew in time between the system clock and the hardware clock.