Final answer:
The Add to Quote button will be displayed on the configuration page after the configuration flow is executed for the first time when there are active constraint rules and the configuration flow has this page defined as End Node. (option C)
Step-by-step explanation:
The situation in which the Add to Quote button will be displayed on the configuration page after the configuration flow is executed for the first time is when there are active constraint rules and the configuration flow has this page defined as End Node.
When there are active constraint rules, it means that certain conditions or restrictions need to be met before the quote can be added. Therefore, if the configuration flow reaches the End Node and the active constraint rules are fulfilled, the Add to Quote button will be displayed.
For example, if a customer is configuring a custom computer and wants to add a specific component that is only available in limited quantities, the active constraint rule would prevent the customer from adding the component if it is out of stock. However, if the component is in stock and all other conditions are met, the Add to Quote button will be displayed.