Select TWO protocols that best meet the following Contoso requirements for Point-to-Site VPN: 1) cross-platform support (Windows, macOS, Linux), 2) support for Azure AD authentication (to enforce Conditional Access/MFA), and 3) NAT traversal support for users behind home routers.

OpenVPN and IKEv2 are the best choices. OpenVPN offers excellent cross-platform compatibility, supports Azure AD authentication, and handles NAT traversal effectively. IKEv2 also provides strong cross-platform support (especially with modern OSes), integrates with Azure AD, and includes built-in NAT traversal capabilities. SSTP is primarily Windows-centric and less ideal for cross-platform. PPTP is outdated and insecure, lacking modern authentication and security features. L2TP/IPsec has broader platform support than SSTP but can be more challenging with NAT traversal and Azure AD integration compared to OpenVPN or IKEv2.