Option D is incorrect . Huawei Cloud's official RDS for PostgreSQL constraints specify that a maximum of five read replicas can be created for one DB instance , not 15. Huawei's current read-replica documentation reiterates the same five-replica limit. The “15 read replicas” characteristic is associated with other Huawei database architectures, such as TaurusDB/GaussDB-related scaling designs, and must not be transferred to standard RDS for PostgreSQL.
Option C is directly supported by Huawei documentation. RDS for PostgreSQL is an object-relational database designed for complex OLTP and supports NoSQL and GIS data types. Huawei explicitly identifies websites, location-based applications, and complex data object processing as representative workloads.
Option B is also valid. Huawei Cloud provides real-time status and performance monitoring for RDS instances, exposing database-related metrics and allowing alarms to be configured for operational monitoring.
Option A reflects the managed-service security architecture: RDS provides controls involving network isolation, security groups, SSL, account authorization, backups, and other mechanisms to protect databases and user data.
The numerical scaling claim in D therefore makes it decisively incorrect.
Reference topics: RDS for PostgreSQL; Read Replicas; Database Monitoring; PostgreSQL Application Scenarios; RDS Security.
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