How do stratum levels relate to the distance from a time source?
A. Stratum 1 devices are connected directly to an authoritative time source.
B. Stratum 15 devices are connected directly to an authoritative time source
C. Stratum 0 devices are connected directly to an authoritative time source.
D. Stratum 15 devices are an authoritative time source.
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A.
“Stratum 0 devices (including atomic and gps clocks) are the most accurate, but cannot be connected to via a network connection. A Stratum 0 device is usually used as a reference clock (or synchronisation source) for a Stratum 1 time server.
Stratum 1 devices are the most accurate ntp time sources accessible via a network connection. A Stratum 1 device would normally be synchronised via a Stratum 0 reference clock.”
https://www.worldtimesolutions.com/support/ntp/What_is_NTP_server_stratum.html