Which NTP service is a best practice to ensure that all network devices are synchronized with a reliable and trusted time source?

Which NTP service is a best practice to ensure that all network devices are synchronized with a reliable and trusted time source?
A . redundant authenticated NTP
B . local NTP within each network device
C . redundant unauthenticated NTP
D . authenticated NTP services from one of the local AD domain controllers

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Answer: A