Is a dedicated device designed to manage encrypted connections established over an untrusted network such as the internet.

a. load balancer
b. vpn concentrator
c. spam filter
d. web server

The correct answer to the following question will be Option B (VPN concentrator).

Explanation:

Virtual Private Network (VPN) is a virtual, limited-use network generated using protocol encryption and tunneling over physical, public network connections.A dedicated tool for managing VPN connections built over an untrusted network, such as the Internet, is called a VPN concentrator.It's a type of networking system that ensures secure VPN connections are established and messages are transmitted between VPN nodes.

Therefore, Option B is the right answer.