Azure Database for PostgreSQL has three deployment options. [A] provides similar benefits as Azure Database for MySQL. You choose from three pricing tiers: Basic, General Purpose, and Memory Optimized. Each tier supports different numbers of CPUs, memory, and storage sizes—you select one based on the load you expect to support. [B] is a deployment option that scales queries across multiple server nodes to support large database loads. [C] offers more controls for fine-tuning to optimize your database with myriad additional server configuration parameters.