You enable column-level security. 
Please select a false statement about the outcomes from this operation.

Answer options:

A.The column will have a higher level of security than the table
B.The column will be hidden in your app
C.The column will return a null value in your app
D.Except for administrator, only members of a Field Security Profile can see the column value

Correct Answer: B 
Dataverse provides column (field) security level on a column-by-column basis for all custom and most system columns. 
Column-level security gives users more granularity. It has a global scope. You need to be cautious of using this feature. You can enable record-level security on the table level. If you enable the column-level of security, it will override the record or table levels for this column. On the app`s screen, the field will be visible and marked as secured with the stars for the field value and a lock sign on the field`s side. The field would return the null value in your app. 
For management simplification, Dataverse groups the secured column (field) permissions into a profile. A system administrator can grant access to the profiles to specific users or teams. Only admin and members of a Field Security Profile can see the column value. 
For more information about Dataverse field-level (column-level) security, please visit the below URLs: 

https://docs.microsoft.com/en-us/power-platform/admin/wp-security-cds#field-level-security-in-dataverse
https://docs.microsoft.com/en-us/power-platform/admin/field-level-security