Which two data stores can you use?

You are creating a multi-page canvas app that loads tabular data from an external data source.

Once loaded, the data must be available to all screens within the canvas app.

You need to reduce the number of times that the app must retrieve data from the data source.

Which two data stores can you use? Each correct answer presents a complete solution. NOTE: Each correct selection is worth one point.
A . parameter
B . global variable
C . collection
D . environment variable

Answer: CD

Explanation:

C: A special kind of data source is the Collection, which is local to the app and not backed by a connection to a service in the cloud, so the information can not be shared across devices for the same user or between users. Collections can be loaded and saved locally.

D: Don’t use environment variables if you only have one environment. Use collection variables. Having a single environment connected to the collection creates more overhead.

Reference: https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/working-with-data-sources