A company runs a self-managed PostgreSQL database on a single EC2 instance. The database currently uses a 500 GB gp2 EBS volume, but the application team reports that the volume cannot sustain the required 12,000 IOPS during peak business hours without adding more capacity. The team wants to guarantee the required IOPS while minimizing storage cost, and the workload does not require sub-millisecond latency or multi-attach. Which EBS configuration should the solutions architect recommend?