How are promotions applied to an order in Vlocity Cart?

To ensure a subscription ends at end of the subscription plan, you use:
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Felix is a Vlocity CPQ administrator, and he needs to create a new context rule for a B2B product that enjoys the full sales cycle of opportunity, quote to order and then to asset. What context scope should he use when he creates his context mapping?
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In Vlocity Context Rules, what value should be entered in the source expression of a context mapping?
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Which are the primary user interface components that make up Vlocity Cart?
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