Which of the following features in Windows 10 combines the functionality from Windows 7 and Windows 8 while also introducing Metro-style applications?

Microsoft Edge is the default web browser introduced in Windows 10 and is not related to combining the UI paradigms of Windows 7 and Windows 8.

SmartScreen Filter is a security feature that checks applications and websites for known malware and phishing, unrelated to the Start menu UI history.

The Windows 10 Start menu reintroduced the familiar left-pane application list and shutdown options from Windows 7 while integrating the Metro-style live tiles from Windows 8 on the right pane. This hybrid design was a deliberate response to user feedback and represents a key UI change distinguishing Windows 10 from its predecessors.

User Account Control (UAC) is a security feature that prompts for permission before allowing changes to the system, not a UI element combining OS generations.