_____ enables application developers to develop, test, and run their software solutions on a cloud platform without the cost and complexity of buying and managing the underlying hardware and software.

a. Autonomic computing
b. Service portfolio management
c. Platform as a service
d. Security as a service

c. Platform as a service
Platform as a service (PaaS) provides users with a computing platform, typically including operating system, programming language execution environment, database services, and Web server. It enables application developers to develop, test, and run their software solutions on a cloud platform without the cost and complexity of buying and managing the underlying hardware and software.