Which two options should AC Computers consider to support both implementation workstreams?

AC Computers has decided to extend its existing Sales Cloud solution by implementing Service Cloud and Marketing Cloud Account Engagement. AC Computers has defined two different work streams for Service Cloud and Marketing Cloud Account Engagement and wants each workstream to work iteratively in separate sandboxes and migrate to a single sandbox for UAT and integration testing. With the multiple workstreams, AC Computers needs a more rigorous change management process and an audit process.

Which two options should AC Computers consider to support both implementation workstreams? Choose 2 answers
A . Use multiple development sandboxes and merge the workstream builds using change sets.
B. Use a version control system and CLI-based deployment tools to merge the workstream builds.
C. Use scratch orgs and continuous deployment tools to merge the workstream builds.
D. Use package-based deployments and scratch orgs to merge the workstream builds.

Answer: A,C