Which two steps should they include to accomplish this journey?

Northern Trail Outfitters wants to build an abandoned cart journey which includes a Decision Split that evaluates if a customer has made a purchase after they enter the journey. Customer data is stored in a master data extension ans purchase data is stored in a second data extension.

Which two steps should they include to accomplish this journey?
A . Use Data Designer in Contact Builder to relate the two data extensions.
B . Utilize Entry Data on a Decision Split within Journey Builder.
C . Create a Data Relationship in Email Studio to relate the two data extensions.
D . Configure activities within Automation Studio to update the purchase data.

Answer: A,B