Which command allows on the switch 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 does not show the time of the flap.

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

Answer: B