How can this be achieved?

A company needs to automatically delete sensitive information after 7 years. This could

delete almost a million records every day.

How can this be achieved?
A . Schedule an ©future process to Query records older than 7 years, and then recursively invoke itself in 1,000 record batches to delete them.
B . Perform a SOSL statement to find records older than 7 years, and then delete the entire result set.
C . Use aggregate functions to query for records older than 7 years, and then delete the AggregateResult objects.
D . Schedule a batch Apex process to run every day that Queries and deletes records older than 7 years.

Answer: D