How Can you Change the line item's configuration in Vlocity Cart?

If you want to limit the duration of a discount on a child product's price, what would you use?

In Vlocity Context Rules, what value should be entered in the source expression of a context mapping?
Note: This question displayed answer options in random order when taking this Test.

A developer configures a context rule to allow customer with Premium Service Level agreements (SLA) to be eligible for Premium Device products. To test: the rule, the developer creates an order for a Premium SLA customer and configures the order in the Cart. In the Cart, the developer notices the Premium Device product is displayed only under the Disqualified tab and cannot be added to the Cart.
What is causing this issue?

How are promotions applied to an order in Vlocity Cart?