What can you do in a dataset recipe?

A consultant wants to optimize data loads by extracting Salesforce objects using independent Einstein Analytics dataflows ahead of time. Which construct should be used to accomplish this?

What are two main steps for creating a dataset?

How can you restrict access to Analytics data at the row level?

Using the Setup menu, the Universal Containers company activated data sync (replication) in the Einstein Analytics settings. After running the sync, they notice that the aggregate sum of a field within their dataset is different than what they manually calculated by summing the same data in the Salesforce object from which the dataset was populated.
Which two differences in the newly synced data can explain this? Choose 2 answers