Conect in the following statement about PaaS is tliat ( )

A、PaaS provides a software deployment platfbnn (mntiine) that abstiacts the hardware and operating system details and spread seamlessly
B、Developers only need to focus on their own seivic logic, not on the bottom layer
C、Users must manage the underlying infrastructure,, including networks, servers, operating systems, or storage
D、Common PaaS seivices include database seivices, web applications, and container seivices