You need to define the current and former employees of several companies in your Dataverse database. You store the companies’ information in custom table A. Table B contains the main information about these people. 
What are the two steps you need to accomplish before creating a connection between the records in two tables?

Answer options:

A.Check the “Enable for activities” for the tables
B.Create One-to-Many (1:N) relationship between tables
C.Check the “Enable connections” for the tables
D.Create Many-to-One (N:1) relationship between tables
E.Create the connection roles

Correct Answers: C and E 
Dataverse identifies the two types of relationships between tables: One-to-Many (1:N) and Many-to-Many (N:N). 
A One-to-Many relationship is a Parent-Child relationship, like between a company and its employees. 
A Many-to-Many relationship is when multiple records from one table have the relationship with the multiple records in another table and vice versa. When users create a Many-to-Many relationship, Dataverse creates a specific intersect matching table between the records in two tables. After you create a N:N relationship, you cannot edit records in both tables. 
Connections are a special case for the Many-to-Many relationships. They are flexible and don`t have the limitations of the N:N relationship. 
You can create a connection between records and define the connection roles from both sides, such as a connection between a person record and a company record in the current employee`s connection role. The same person`s record can be connected to another company in the role of the former employee. And this role for the company record can be mapped to the former employer role. 
Before you create a connection between two tables, you need to check the "Enable connections" for both tables. And then create new connection roles that you will use when you connect the records. Dataverse provides a list of standard connection roles that you can use. But it is recommended to create and use your roles for business flexibility. 

All other options are incorrect. 
For more information about the Dataverse record connection roles, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/maker/data-platform/configure-connection-roles
https://docs.microsoft.com/en-us/powerapps/user/add-connection-role