Characteristics of public cloud include: B. Lower total cost of ownership: Public cloud services often lead to lower total cost of ownership (TCO) due to shared resources, economies of scale, and the cloud provider managing the infrastructure, which reduces the IT overhead for customers. D. Multitenant server: Public cloud environments typically employ a multitenancy architecture, where a single instance of software and its supporting infrastructure serves multiple customers. Each customer shares the underlying infrastructure, but their data is kept separate.
References:
Public cloud services and deployment models overview
Cloud computing principles and architectures