Gellin's Gelatins, a dessert manufacturer, is developing a new payment portal for customers to review and pay invoices. The existing system is a third-party software, and developing an in-house software is a new project. The developer team works together, in person, at the Boston corporate office and is known for creative problem solving and design. The system has many predefined requirements due to the sensitivity of processing payments and capturing sensitive customer data, including some regulatory specifications. Should Gellin's Gelatins use waterfall or Agile SDLC management methodologies? Explain your selection, including why your methodology is a suitable choice for the described project