Not quite correct. Try using 0 for increment Y. It is disallowed.

https://www.mssqltips.com/sqlservertip/4652/how-to-change-default-data-and-log-file-directory-for-sql-server-running-on-linux/
… to me indicates otherwise.

Elegant!
- Yet, if I only wanted to add an identity column, in order to keep the table name (and save on storage), I would use simply
ALTER TABLE...

https://blogs.msdn.microsoft.com/sqlserverstorageengine/2017/02/21/sql-server-2016-developer-edition-in-windows-containers/  indicates SQL 2016 is also available.

Oh! … Briefly feared a trick question related to compatibility 'version' rather than 'level'.

Great demo to be seen here: https://www.youtube.com/watch?v=aIK6XPSkLQc

Another case of correct answer first, plus some added alternatives. I have a distinct feeling first answer is more often than the others the correct choice.

Earlier census db downloads also lists Turkeyfoot and Turkyfoot Township, both PA.
But, well, six was not an option ...
https://www.philadelphiabuildings.org/pab/app/view_location.cfm/NULL,45136,111,1,1

Hilarious!

Wouldn't just putting 100.0 at the front of the calculation be the more elegant and parsimonious way to go?

Easy to answer. But actually a bit weird and impractical then, that the return type is nvarchar(258).

Yesterday I was right, but today answer registers red?? How come??

Even without the missing ')', one gets it right! - But it takes a code correction to get it wrong in the right way, so to speak.