Which two fields would need minimal consideration, for size/scalability related reasons, when creating a data extension to house this data?

Northern Trail Outfitters to bring subscriber data from its data warehouse into Marketing Cloud.

Which two fields would need minimal consideration, for size/scalability related reasons, when creating a data extension to house this data? Choose 2 answers
A . Number
B . Text
C . Boolean
D . Decimal

Answer: A,B