Which database configuration meets these requirements MOST cost-effectively?

A company is developing an Internal application that uses a PostgreSQL database. The company has decided to host the database on Amazon Aurora. The application does not need to be highly available but data must be stored in multiple Availability Zones to maximize durability.

Which database configuration meets these requirements MOST cost-effectively?
A . An Aurora PostgreSQL DB cluster with a single D8 Instance
B . An Aurora PostgreSQL DB cluster with a primary DB instance and a read replica
C . An Aurora PostgreSQL DB cluster with Multi-AZ deployment enabled
D . An Aurora PostgreSQL global database cluster

Answer: B

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