A Virtual Private Network (VPN) is the most suitable option for securely accessing the internal network because it creates an encrypted tunnel for data traffic between the remote user and the organization's network, protecting sensitive information while traversing public networks. Secure Sockets Layer (SSL) only encrypts data for specific sessions, which might not encompass all the sensitive traffic. Wi-Fi Protected Access 2 (WPA2) is a security protocol designed to secure wireless networks, not to protect data in transit over public networks between a remote user and an internal network. Lastly, Transport Layer Security (TLS) provides encryption for data-in-transit but typically secures data between web browsers and servers, rather than providing full network access like a VPN.