What are the four layers of security that keep Android devices safe?

A multi-layered approach from hardware, OS, management APIs and Google services such as Google Play Protect
A multi-layered approach from Android Security Suite, management API’s, hardware and Google services such as Google Play Protect
Anti-virus applications, network traffic monitoring tools, strict policy control and OEM security suite
A multi-layered approach from hardware, anti-virus applications, Android Security Suite and Google services such as Google Play Protect