Final answer:
Product-specific access control is an optional feature that restricts access to knowledge bases and articles based on products owned by the customer. Customers need to provide proof of purchase or have their accounts associated with the specific products they own to use this feature.
Step-by-step explanation:
The optional feature that restricts access to knowledge bases and articles based on products owned by the customer or consumer is called product-specific access control.
This feature allows companies to limit access to certain information or resources only to customers who have purchased specific products related to that information. For example, a software company may restrict access to advanced tutorials or support articles only to customers who have purchased their premium software package. To use this feature, customers need to provide proof of purchase or have their accounts associated with the specific products they own. Overall, product-specific access control is a flexible and effective way for companies to provide targeted information and resources to their customers based on their product ownership.