Which one of the following activities would present a significant security risk to organizations when employing a Virtual Private Network (VPN) solution?

VPN bandwidth is a performance and capacity planning concern, not a direct security risk to the organization's network or data.

Simultaneous connection to other networks refers to split tunneling, where a VPN client is connected to both the secure corporate VPN and an external untrusted network (such as the public internet) at the same time. This creates a significant security risk because an attacker could use the unsecured connection as a pivot point to reach the corporate network through the VPN tunnel, effectively bypassing perimeter security controls.

IP addressing conflicts are a network configuration and connectivity issue that can disrupt VPN service, but they do not inherently introduce a security vulnerability or expose the organization to attack.

While remote users with administrative rights is a risk management concern related to least privilege, it is not a risk specific to VPN solutions themselves, and is a general access control issue that exists independently of VPN use.