AWS Certified Solutions Architect - Professional (#305)

An organization is setting up RDS for their applications. The organization wants to secure RDS access with VPC. Which of the following options is not required while designing the RDS with VPC?

The organization must create a subnet group with public and private subnets. Both the subnets can be in the same or separate AZ.
The organization should keep minimum of one IP address in each subnet reserved for RDS failover.
If the organization is connecting RDS from the internet it must enable the VPC attributes DNS hostnames and DNS resolution.
The organization must create a subnet group with VPC using more than one subnet which are a part of separate AZs.