API's are not available for use in which Salesforce.com edition?

B.

API (Application Programming Interface) is a set of protocols, routines, and tools for building software applications. It allows different software applications to communicate with each other. Salesforce offers APIs for various functionalities such as data management, integration, and custom application development.

Salesforce offers four different editions of its platform, each with its own set of features and functionalities. These editions are:

1. Developer Edition
2. Professional Edition
3. Enterprise Edition
4. Unlimited Edition

Out of these four editions, API access is available for all editions except for the Professional Edition. This means that the correct answer to the question is B. Professional Edition.

In the Professional Edition, users do not have access to Salesforce APIs. This is because the Professional Edition is designed for small to medium-sized businesses with basic CRM requirements, and its features are limited compared to other editions.

In contrast, the Developer Edition, Enterprise Edition, and Unlimited Edition all provide API access. The Developer Edition is a free, fully-featured version of Salesforce that is designed for developers to test and build custom applications. The Enterprise and Unlimited Editions are more robust versions of Salesforce that are designed for larger organizations with complex business requirements.

In summary, Salesforce APIs are not available for use in the Professional Edition, while API access is available in the Developer, Enterprise, and Unlimited Editions.