Final answer:
Trip Flex allows customers to cancel their existing itinerary and receive a full refund without any cancellation fees.
Step-by-step explanation:
Trip Flex is a feature offered by certain travel companies, such as Spirit Airlines, that allows customers to cancel their existing itinerary and receive a full refund without incurring any cancellation fees.
With Trip Flex, customers have the flexibility to change or cancel their plans without penalty, as long as the cancellation is made within a specific time frame, usually within 24 hours of booking.
So, the correct answer to your question is: 3) Full refund. When a customer cancels their existing itinerary with Trip Flex, they will receive a full refund.