[Michael Singer]

Hi. I’m also a little confused on this question. The question doesn’t specify which subnets are in the initial subnet group – but I believe the answer relies on the fact that only 2 subnet groups were in the initial subnet group? Since there were only 2 subnets initially and launching an RDS instance requires 2 subnets – you wouldn’t be able to delete one subnet (since it would only leave you with one) unless you switch to a Single-AZ deployment.

Anyone else have thoughts on this above theory/understanding?

[Michael Singer]

Thanks Joboy! Appreciate your clarification!