Ronald is a software architect at mindspace software. he has been approached to develop

ronald is a software architect at mindspace software. he has been approached to develop a critical application for a finance company. the company has asked him to ensure that the employed coding process is secure. they have also requested that the project be completed in a few months, with a minimum version of the identified functionalities provided. the other functionalities can be developed later and added to the software while the application is live. which development process would be ideal for ronald to employ to achieve this objective?