Which of the following cloud types does Dropbox, an application accessible to anyone via the open Internet, exemplify?

Dropbox is a cloud-based file hosting and synchronization service that allows users to store and access their files from anywhere using the Internet. It operates on a public cloud infrastructure, which means that the service is provided over the Internet and is available to a wide range of users. In a public cloud, the infrastructure and resources are shared among multiple users or organizations, and the service provider is responsible for managing and maintaining the underlying infrastructure.