b$.$ Consider the same narrative as described in the beginning, except include the possibility flights and$/$or rooms are not available within their budget. If nothing meets their budget, they try alternate dates. If they cannot find anything within budget on the alternate dates, they cancel their trip. a $.$ Focusing on the part of the diagram that describes the reservation process, both for flights and hotelswhich of the following partial models would acceptably replace the parallel gateways and reservations tasks so that the model addresses the new situation? $($ Select each link to view the model choices and select the appropriate answer using the corresponding buttons below.$)$ Model $1$ Model $2$ Model $3$