What is the primary built-in quality check in Salesforce?

The primary built-in quality check in Salesforce is Apex Tests. Apex Tests are designed to ensure that the code written in Salesforce’s Apex programming language functions correctly and meets the required business logic. These tests are essential for validating the behavior of various components in the platform, such as classes and triggers. They help detect errors early, support continuous integration, and ensure that new changes do not break existing functionality.

Apex Tests provide a structured approach to quality assurance in Salesforce applications. Each test must cover a specified percentage of the code, and passing these tests is a requirement for deploying Apex code to a production environment. The emphasis on tests ensures that only well-functioning code is promoted to higher environments, thus maintaining system stability and reliability.

While other choices like User Acceptance Testing, Code Reviews, and Static Code Analysis are important aspects of software development and can contribute to overall code quality, they are not considered built-in checks within Salesforce as Apex Tests are. User Acceptance Testing focuses on end-user validation, Code Reviews involve peer evaluations of code changes, and Static Code Analysis uses tools to examine code for potential errors without executing it, but none of these replace the necessity of executing Apex Tests to guarantee functional correctness.