What advantage does the Ajax-based JavaScript SDK provide when using Force.com canvas?

The Ajax-based JavaScript SDK provides significant advantages when using Force.com canvas, particularly in the realm of accessing Salesforce data seamlessly. When a developer uses this SDK, they can leverage Ajax calls to interact with the Salesforce data directly. This capability allows embedded applications to retrieve, update, or manipulate Salesforce data without requiring extensive additional configurations.

The SDK simplifies the integration process by providing a set of pre-defined methods that handle authentication and data retrieval, thereby enabling a more streamlined development experience. This means that app developers can focus on creating rich user experiences while ensuring that the app remains connected and aligned with the Salesforce environment.

In contrast to the other offered choices, the Ajax-based JavaScript SDK does not inherently enable apps to run completely offline, as Salesforce data interactions typically require an online connection. It also does not create separate hosting environments for each app, as Force.com canvas allows multiple embedded applications to share the same Salesforce environment seamlessly. The option stating "None of the above" does not hold because option A accurately describes a primary benefit of using the SDK. Therefore, the focus on easy access to Salesforce data is a core functionality provided by the Ajax-based JavaScript SDK in the context of Force.com canvas integration.