Which type of API allows authorized salespeople to access internal sales data from mobile devices?

The correct choice is private API. A private API is designed for internal use within a specific organization. It provides a secure way for authorized users, such as salespeople in this context, to access sensitive or proprietary internal data, such as sales records or customer information, while also ensuring that only authenticated and authorized individuals can make requests. This kind of API is typically built with security measures and access control protocols to protect the integrity of the data.

In contrast, open APIs are available for public use and are not restricted to specific users, which would not be suitable for accessing sensitive internal data. Public APIs are similar in nature to open APIs, allowing external developers to interact with the data, but these are usually designed for broader access rather than for company-specific data. An enterprise API is a term that can sometimes refer to APIs designed for use within large organizations, but it does not specifically indicate the restrictions on access typically found with private APIs.