Final answer:
Priority Codes are used to indicate the level of importance or urgency, usually with Priority 1 being the highest. The correct Priority Code used for a Revenue Passenger Activation in a particular system depends on specific company procedures and cannot be determined without additional context.
Step-by-step explanation:
The Priority Code used to activate a Revenue Passenger varies depending on the airline's specific procedures. However, in general business operations and systems that prioritize customer or product categories, they are often ranked from Priority 1 being the highest to Priority 4 being the lowest. Without additional context on the specific system you are referencing, it's difficult to provide a definitive answer. In many cases, a Priority 1 code would be used for the most urgent or high-status items, though you should always refer to your company's specific guidelines or reference materials.