Which of the following is the wrong statement about PolarDB design architecture?

A PolarDB cluster contains one primary instance and up to 15 read-only instances

PolarDB consolidate compute processes and storage processes in one box, allowing the database capacity to scale up and down to meet your

application needs in Alibaba Cloud

Read/write splitting is enabled for PolarDB clusters by default, providing transparent, highly available, and self-adaptive load balancing for your

database

High speed network connection is enabled between the DB server and the chunk server, and data are transferred using the Remote Direct Memory Access (RDMA) protocol