I have a question regarding the journey builder. I have multiple journeys in the marketing cloud. I want to restrict Customers to enter in only one journey. Suppose we have two journies in the marketing cloud (JourneyA and JourneyB). When a customer enters in JourneyA He will not subscribe in journeyB. Is there any way in the marketing cloud to avoid the customer resubscribing to another journey if he exists in someone else journey?