Which command allows the logging on the switch to show the time of the flap according to the clock on the device?

A network engineer is investigating a flapping (up/down) interface issue on a core switch that is synchronized to an NTP server. Log output currently does not show the time of the flap .

Which command allows the logging on the switch to show the time of the flap according to the clock on the device?
A . service timestamps log uptime
B . clock summer-time mst recurring 2 Sunday mar 2:00 1 Sunday nov 2:00
C . service timestamps log datetime localtime show-timezone
D . clock calendar-valid

Answer: C

Explanation:

By default, Catalyst switches add a simple uptime timestamp to logging messages. This is a cumulative counter that shows the hours, minutes, and seconds since the switch has been booted up