Question: We are setting up the PROD environment in AWS and we need some help in choosing what option to go for database subnet group. We

We are setting up the PROD environment in AWS and we need some help in choosing what option to go for database subnet group. We have 3 options :

1. Within non routable private subnet 2. Within routable private subnet 3. Including all subnets (default)

Firstly, I tested accessing the database which only had non-routable subnet and could not connect to the RDS (Postgres). Secondly, Although I was able to add the routable subnets later to the database, we wont be able to change the non-routable ip address assigned to the RDS later.

Will I need to go create the database on both routable and non-routable subnets as we need to be able to connect to the database from other applications? Or from the options I have given, which is the best one?

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