A company moved its on-premises PostgreSQL database to an Amazon RDS for PostgreSQL DB instance.The company successfully launched a new product.The workload on the database has increased.The company wants to accommodate the larger workload without adding infrastructure.
Which solution will meet these requirements MOST cost-effectively?
Buy reserved DB instances for the total workload. Make the Amazon RDS for PostgreSQL DB instance larger.
Make the Amazon RDS for PostgreSQL DB instance a Multi-AZ DB instance.
Buy reserved DB instances for the total workload. Add another Amazon RDS for PostgreSQL DB instance.
Make the Amazon RDS for PostgreSQL DB instance an on-demand DB instance.
I systematize that the answer is:
Buy reserved DB instances for the total workload. Make the Amazon RDS for PostgreSQL DB instance larger.