Which of the Following Statements Is Wrong When Comparing RDS

Which of the following statements is wrong when comparing RDS with self-built database?

A) RDS features a high availability of 99.95% while self-built database requires you to implement data protection, primary-standby replication, and RAID all by yourself.
B) RDS provides automatic backup while self-built database requires you to prepare storage space for backup copies and regularly verify that these copies can be restored.
C) Self-built database supports quick deployment and elastic scaling.
D) RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.