Which feature of Cisco AnyConnect allows pie-login authentication using windows machines, or single sign-on user authentication using Windows logon credentials?

Secure Layer-2 Network Access allows AnyConnect to initiate network authentication before the Windows desktop loads, supporting pre-login scenarios. It also enables single sign-on by passing Windows logon credentials directly to the network authentication process, eliminating the need for users to authenticate twice. This capability is unique to this feature and operates beneath the OS session layer.

Flexible AAA Options refers to AnyConnect's support for multiple authentication, authorization, and accounting backends such as RADIUS and LDAP, not pre-login or Windows SSO.

Differentiated Mobile Access provides distinct access policies for mobile devices based on platform type, not pre-login authentication using Windows credentials.

Trusted Network Detection determines whether the endpoint is on a trusted corporate network to decide if VPN should connect, which is unrelated to Windows logon-based SSO.