What is a recommended way to transfer record insertions and updates to the data warehouse?

Universal Containers has a data warehouse system that collects information from upstream systems in order to do proprietary reporting. Every day there are several thousand record insertions and updates in Salesforce that might be a interest to this data warehouse. Reports in the data warehouse are run at the end of the month.

What is a recommended way to transfer record insertions and updates to the data warehouse?
A . Use the SOAP API’s getUpdated() method to retrieve changed record IDs, then retrieve records.
B . Use scheduled Apex to do an Apex callout to the data warehouse.
C . Use native Outbound message functionality to send a message with each record change.
D . Use a trigger to do an Apex callout to the data warehouse with each record change.

Answer: A