Customers use infrastructure and programming tools supported by the cloud service provider to develop their own applications. For example, AWS Elastic Beanstalk and Windows Azure provide computing platforms, including operating system, programming language execution environment, database, web server, etc. This is called __________.

A. Premise as a service (PaaS) B. Platform as a service (PaaS) C. Infrastructure as a service (IaaS) D. Software as a service (SaaS) E. Capacity as a service (CaaS)