Design the application architecture - Plan the application layers

A significant change has been requested in an application maintained within your company. The application is a classic ASP application that uses custom Open Database Connectivity (ODBC) drivers to connect to a relational data repository on a mainframe computer. The CIO decided that the company needs to replace this 30-year-old system. The team that worked on the original project is made up of developers who have never worked with an object-oriented approach before. Which approaches would be the best to use when designing your initial schema in Entity Framework? (Choose all that apply)

Use Code First.
Use Database First.
Use Model First.
Create your own custom design because it’s too much work to manage an inexperienced staff.