An online application consists of a front-end service, a back-end business logic service, and a relational database. The front-end service is stateless and runs in an instance group that scales between two and five servers. The back-end business logic runs in a Kubernetes Engine cluster. The database is implemented using Cloud SQL PostgreSQL. How many trust domains should be used for this application?

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An online application consists of a front-end service, a back-end business logic service, and a relational database. The front-end service is stateless and runs in an instance group that scales between two and five servers. The back-end business logic runs in a Kubernetes Engine cluster. The database is implemented using Cloud SQL PostgreSQL. How many trust domains should be used for this application?