If a customer expects to ingest 2 million vulnerabilities during its initial load, the recommended instance size should be XXL. This is because an instance size XL is suitable for less than 1 million vulnerabilities, while an instance size Ultra is recommended for over 2.5 million vulnerabilities. XXL fits the requirement for ingesting 1 to 2.5 million vulnerabilities.

The business rule that creates a Configuration Item from a Vulnerable Item record is most accurately described as 'Create CI from Vulnerable Item Details'. This explicitly states the relationship between the Vulnerable Item and the Configuration Item created from it.

The components installed with Vulnerability Response typically include Tables, Scheduled Jobs, and Security Operations Common. These elements are foundational to handling and responding to vulnerabilities within a system, providing necessary structure (tables), automation (scheduled jobs), and integration (Security Operations Common).

Scoped applications encapsulate and protect data and functionality. This is achieved by restricting access to the application’s data and scripts through the use of namespaces, which ensures that the application’s environment is isolated from other applications. This encapsulation prevents interference from other applications, including those within the global scope, thereby enhancing security and stability.

The ID associated with the Vulnerability Response plugin is com.snc.vulnerability. This ID is specific to the ServiceNow platform's Vulnerability Response module, which focuses on identifying and managing vulnerabilities in various systems.