Universal Containers wants Sales Reps to process credit card payments when an Opportunity is Closed Won. Which approach should the System Administrator use to enable this feature? a. Add payment detail custom fields to the Opportunity.
b. Build a standard Visualforce page and Salesforce site.
c. Install an AppExchange credit card payment package.
d. Create a Workflow Rule Email Alert to notify Finance.

d. Create a Workflow Rule Email Alert to notify Finance.

Explanation:

Since Universal Containers wants the sales representatives to process credit card payments when an opportunity is closed win, the system administrator should create a workflow rule email alert to notify finance.

The workflow rules are refered to as automatic processes which trigger an action when there's occurence of a certain event. Therefore, the correct option is D.