Question

The clock used in GPS and GLONASS is​

Answer 1

Answer:

All of them have an internal atomic clock with high stability and the mean between those clocks provides a time standard, derived from the global standard known as TAI. That is why the GNSS systems can be used as a global time reference with accuracy of up to nanoseconds, besides from providing geolocation.

Explanation:

Answer 2

Answer:

atomic clock is the right answer