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A company has four private subnets within a VPC. Two of the subnets are used for running database instances and the other two are used for application instances. Separate route tables are used for the database and application subnets. A NAT gateway is defined in the route tables to provide internet connectivity for the subnets. The security team requires that the database subnets should not have internet access. A security engineer must remove internet connectivity for the database subnets without affecting the application subnets. Which approach should the security engineer take?