In ServiceNow, the "Allow access to this table via web services" option within the Application Access settings determines whether the table can be accessed through web service protocols, such as REST and SOAP. When this option is selected, it permits the table to be accessible via web services; however, it does not override existing permissions. The user or system making the web service request must still have the appropriate permissions (such as roles and access controls) to perform operations on the table's records.
* Option A: Incorrect. If the "Allow access to this table via web services" option is not selected, the table is not accessible via web services, regardless of user permissions.
* Option B: Correct. Enabling this option allows the table to be accessed via web services, but the user must have the correct permissions to access the table's records.
* Option C: Incorrect. This option applies to all web service protocols, including both SOAP and REST.
* Option D: Incorrect. This option controls overall web service access to the table; specific operations (create, read, update, delete) are governed by user permissions and access controls.

Web services are software systems that use standardized protocols and formats, such as XML and HTTP, to exchange data and messages between different applications or systems over the Internet or other networks12. Web services enable interoperability and integration among diverse software components, regardless of their programming languages, platforms, or architectures34.
References = 1: What are Web Services? - GeeksforGeeks 2: Web service - Wikipedia 3: What are Web Services? - Online Tutorials Library 4: What is a Web Service? | Webopedia

The elements of an Access Control are evaluated in the following order: Conditions, Roles, Script. The Conditions are a set of criteria that must be met for the Access Control to apply. The Roles are a list of user roles that are required to access the object. The Script is an optional script that can further restrict or allow access based on custom logic. If any of these elements return false, the Access Control denies access and stops evaluating the remaining elements. Reference: Access control rules