Which type of masking directly masks and subsets data In a nonproduction database with minimal...

In-Database

In-Database mode directly masks and subsets the data within a non-production database with minimal or no impact on production environments. Since the In-Database masking and subsetting mode permanently changes the data in a database, it is strongly recommended to use this mode for non-production environments such as staging, test, and development databases rather than using it on production databases.

https://docs.oracle.com/database/121/DMKSB/intro.htm#DMKSB-GUID-F949A83E-3C01-45B5-9BAF-9940BB140AA0