If you want to check the build of RTC and Development environment please refer below articles.
- How to check Microsoft Dynamics NAV build : RoleTailored Client
- How to check Microsoft Dynamics NAV build : Development Environment
To check the service build, open the Microsoft Dynamics NAV 2015 Administration and Select the instance.
In the right side view you can see the service build.
Please provide your feedback with a comment.
Thank you and Regards,
Tharanga Chandrasekar