Which of the following is the best way to provide secure, remote access for employees while minimizing the exposure of a company’s internal network?

A Virtual Private Network (VPN) is the best option because it creates an encrypted tunnel over a public network, allowing remote users to securely access internal resources as if they were directly connected to the company's private network. This minimizes exposure by isolating internal network traffic within the secure tunnel. LDAP (Lightweight Directory Access Protocol) is used for directory services and authentication, not remote access. FTP (File Transfer Protocol) is for file transfer and is inherently insecure without additional encryption (like SFTP or FTPS), and it doesn't provide full network access. RADIUS (Remote Authentication Dial-In User Service) is an authentication, authorization, and accounting (AAA) protocol, often used in conjunction with VPNs, but it does not itself provide the secure remote access tunnel.