2 Answers
Hi Simon,
When approaching an CSAP question, you really need to look at it from a wider view as an Architect would. Loosely coupled interfaces will generally allow for more flexible architectures and migrations over tightly coupled interfaces. This is covered in several other whitepapers, including the AWS Well-Architected collection and in the whitepaper "Architecting for the Cloud".
These are not specifically resources for migrations but cloud architecture in general which you should be familiar with going into the Exam.
–Scott
This helped me better understand tight- vs loose coupling: https://nordicapis.com/the-difference-between-tight-coupling-and-loose-coupling/