What are three benefits of using an extract as compared to a live connection to a data source? (Choose three.)

A. A live connection to a data source provides the best performance for data connections.

B. Calculated fields perform better in workbooks connected to extracts than in workbooks with live connections to a data source.

C. Extracts are stored in memory (RAM), resulting in faster query performance as compared with live data connections.

D. An extract reduces the amount of data stored on a client computer as compared to a live data connection.

E. A live connection to a data source can be slow due to network and user traffic, whereas a connection to an extract improves performance.

Explanation:
But live connections also rely on the database for all queries. And unlike extracts, databases are not always optimized for fast performance. With live connections, your data queries are only as fast as the database itself.

Reference: https://www.tableau.com/about/blog/2016/4/tableau-online-tips-extracts-live-connections-cloud-data-53351#:~:text=Extracts%20tend%20to%20be%20much,%2C%20filters%2C%20calculations%2C%20etc.&text=Live%20connections%20offer%20the%20convenience,data%20source%20reflected%20in%20Tableau