Interviewer (Chandrali) definitely have deep understanding of topics. If we can get some interview videos for senior post where she is giving the interview for scenario based question that will be more helpful.
Data governance includes access permission for a user or a group , we can restrict user to read any specific location or we call it data masking ... Second thing unity catalog also store metadata
If repartition happens at driver, do u think entire gbs of data travell to driver from all executors and then driver divide and give it to all executors... Then your understanding about spark is wrong.....