* Tooling API: * The Tooling API provides programmatic access to manage tests and other metadata in the org. * It can execute test classes or methods remotely. * Developer Console: * The Developer Console is a built-in Salesforce tool to execute Apex tests, debug logs, and more. * Allows developers to execute tests interactively. * B. Metadata API: Used for managing metadata, not for running tests. * C. Bulk API: Used for data operations, not related to testing. * Tooling API Overview: https://developer.salesforce.com/docs/atlas.en-us.api_tooling.meta/api_tooling/ * Testing with Developer Console: https://help.salesforce.com/s/articleView?id=sf. code_dev_console_test.htm