In OpenStack, which of the following descriptions about how the cloud platform or its core services work is wrong?

In OpenStack, which of the following descriptions about how the cloud platform or its core services work is wrong?
A . Nova makes asynchronous calls to request responses. When a request is accepted, a callback is triggered immediately. Due to the use of asynchronous communication, no user action will be placed in a waiting state for a long time.
B . When deploying an OpenStack cloud, the message queues and databases used for communication between different processes in a service are selected one-to-one.
C . Swift adopts a completely symmetrical, resource-oriented distributed storage architecture design. All components are scalable to avoid the spread of single point failures and affect the operation of the entire system.
D . Each openstack service is composed of multiple processes. All services (except Keystone) have at least one API process that listens for API requests, pre-processes the requests and passes them to other parts of the service.

View Answer

Answer: B