Why would a log file contain a * next to the date?

Why would a log file contain a * next to the date?
A . The network device is not configured to use NTP time stamps for logging.
B . The network device was unable to reach the NTP server when the log messages were recorded.
C . The network device is not configured to use NTP
D . The network device was receiving NTP time when the log messages were recorded

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Answer: B