You want to add the business rules to your canvas app. 
Please select the business rules that you can use in your app.

Answer options:

A.Show Error messages
B.Enable columns
C.Set column values
D.Hide columns
E.Validate data

Correct Answers: A, C,and E 
Microsoft Dataverse provides Business rules functionality with no need to write a code. Users can use a business rule designer to create the rules. Business rules comprise three parts: conditions, actions, and scope. 
The scope for canvas apps is Entity. The model-driven apps have additional scopes of All and Individual forms. 
An entity level of Business rules actions includes Set column values, Clear column values, Set column requirement levels, Validate data and Show error messages. 
The presentation (forms) level has additional Show or hide columns, Enable and disable columns, and Create business recommendations actions. Options B and D are incorrect because these actions are available only to model-driven apps but not to canvas apps.
For more information about Power Apps business rules, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/maker/data-platform/data-platform-create-business-rule
https://docs.microsoft.com/en-us/learn/modules/define-create-business-rules/1-rules