You need to create a ribbon command. 
Please select the three ribbon command definition elements.

Answer options:

A.Enable Actions
B.Enable Rules
C.Display Actions
D.Display Rules
E.Actions

Correct Answers: B, D and E 
A Ribbon command is a definition that ribbon control elements can reference. If you open your solution in the Ribbon Workbench (Number 1), you can select a Command (Number 2) from the Solution elements (Number 3) for your entity. The left side panel shows the Command properties (Number 4). There are three command definition elements: 

All other options are incorrect. 
For more information about the Ribbon commands, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/define-ribbon-commands
https://ribbonworkbench.uservoice.com/knowledgebase/articles/358664-create-a-command-bar-button-for-your-custom-acitiv
https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/customize-commands-ribbon