The leadership team at Get Cloudy Consulting has identified a total of ten text fields on the Contact object as critical. The team wants to capture any changes made to these fields, including the following:

• who made the change
• when they made the change
• what is the old value
• what is the new value

Get Cloudy Consulting needs to be able to report on these field data changes within Salesforce for the past 3 months.

Which two approaches will meet this requirement? (Choose two.)

A. Create a workflow to evaluate the rule when a record is created and use field update actions to store previous values for these ten fields in ten new fields.
B. Create a Contact report including these ten fields and Salesforce Id, then schedule the report to run once a day and send email to the admin.

C. Write an Apex trigger on Contact after insert event and after update events and store the old values in another custom object.

D. Turn on field Contact object history tracking for these ten fields, then create reports on contact history.