Which two methods should be used to mitigate this risk?

Universal Containers has just initiated a project to implement a custom container tracking application with a large development team. The project manager is concerned that the large number of developers in a single developer pro sandbox could lead to challenges with code being overwritten.

Which two methods should be used to mitigate this risk? Choose 2 answers
A . Provide each developer their own sandbox developer org and implement a code repository and continuous integration to merge code into the developer pro sandbox
B. Replace the developer pro sandbox with a Partial copy sandbox
C. Use a single sandbox and strictly coordinate development across shared components, and implement a code repository to allow developers to merge code into a common repository
D. Provide each developer their own sandbox developer org, and implement managed packages to deploy to the merge

Answer: A,C