Which of the following is not included in CodeScan's capabilities?

The correct answer is that CodeScan does not exclusively check Visualforce pages. CodeScan is designed to provide comprehensive static code analysis across various Salesforce technologies and frameworks, which includes JavaScript, Lightning Components, and Apex classes.

While CodeScan does include capabilities for analyzing Visualforce pages, it is not limited to just that. The term "exclusively" suggests a singular focus which is not accurate, as CodeScan is robust and supports analysis across multiple code types in Salesforce development. The focus on a singular technology like Visualforce does not reflect the broader capabilities of the tool, which enables developers to maintain quality and security across a more extensive array of coding standards and practices.

In contrast, the other options reflect actual capabilities of CodeScan. Static analysis of JavaScript code, support for Lightning Components, and analysis of Apex classes are all integral parts of what CodeScan offers to help developers identify vulnerabilities, enforce coding standards, and ensure code quality across their Salesforce projects.