Final answer:
A Platform-as-a-Service (PaaS) computing environment provides a platform for the development, deployment, and management of applications. Heroku is an example of a PaaS computing environment. The correct answer is 3) Platform-as-a-Service (PaaS).
Step-by-step explanation:
A Platform-as-a-Service (PaaS) computing environment is a cloud computing model that provides a platform for the development, deployment, and management of applications.
It offers a complete development and runtime environment for developers to build, test, and deploy their applications without the need to worry about managing the underlying infrastructure.
An example of a PaaS computing environment is Heroku. Heroku is a cloud application platform that allows developers to deploy, manage, and scale their applications without having to manage the infrastructure.
Therefore, the correct answer is 3) Platform-as-a-Service (PaaS).