Which 3 options should help improve the dashboard performance?

NTO uses salesforce to manage relationships and track sales opportunities. It has 10 million customers and 100 million opportunities. The CEO has been complaining 10 minutes to run and sometimes failed to load, throwing a time out error.

Which 3 options should help improve the dashboard performance? Choose 3 answers:
A . Use selective queries to reduce the amount of data being returned.
B . De-normalize the data by reducing the number of joins.
C . Remove widgets from the dashboard to reduce the number of graphics loaded.
D . Run the dashboard for CEO and send it via email.
E . Reduce the amount of data queried by archiving unused opportunity records.

Answer: A,B,E