In which two ways should the admin configure Data Designer to allow this data to be used within a Journey?

A Marketing Cloud admin is configuring the Marketing Cloud data model for the first time. Journey Builder with of messages being sent to customers, based on if there has been an order or not.

There are two existing data model Orders:

– Customers contains information about subscribers including Email Address, First Name, Last name.

– Orders contains information about the orders and includes the unique identifier of the customer

In which two ways should the admin configure Data Designer to allow this data to be used within a Journey? Choose 2 answers
A . Link the Customers data extension to the data model using Customer ID
B . Link the Orders data extension to the Customers data extension using a Many-to-Many relationship
C . Link the Orders data extension to the Customers data extension using a One-to-Many relationship
D . Link the Customers data extension to the data model using Email Address

Answer: A,C