A Public API can be accessed by:

A Public API is designed to be accessible over the internet to anyone. This characteristic is fundamental to its purpose: to allow developers, applications, and systems to interact with the API without restrictions on who may use it. Public APIs are often used to promote services, enable third-party applications, and facilitate broader integration among different systems.

Because of their open access, public APIs typically offer functionalities that can benefit various users across diverse environments. For instance, a public API could allow developers to retrieve data from a public service, integrate with a popular platform, or interact with cloud-based resources.

On the other hand, options indicating limitations on access, such as requiring registration, restricting use to specific partners, or limiting access to internal users, describe other types of APIs, such as private or partner APIs. These types are typically designed to control access and ensure that only authorized users or applications can interact with the resources, which does not align with the openness characteristic of a public API.