You are building a system to perform outlier detection for a large online retailer. You need to build
a system to detect if the total dollar value of sales are outside the norm for each U.S. state, as
determined from the physical location of the buyer for each purchase.
The retailer’s data sources are scattered across multiple systems and databases and are
unorganized with little coordination or shared data or keys between the various data sources.
Below are the sources of data available to you. Determine which three will give you the smallest
set of data sources but still allow you to implement the outlier detector by state.

A.
Database of employees that Includes only the employee ID, start date, and department

B.
Database of users that contains only their user ID, name, and a list of every Item the user has
viewed

C.
Transaction log that contains only basket ID, basket amount, time of sale completion, and a
session ID

D.
Database of user sessions that includes only session ID, corresponding user ID, and the
corresponding IP address

E.
External database mapping IP addresses to geographic locations

F.
Database of items that includes only the item name, item ID, and warehouse location

G.
Database of shipments that includes only the basket ID, shipment address, shipment date, and
shipment method