Final answer:
The correct statement is that LAN-to-WAN connections expose internal systems to external threats, highlighting the important role of securing this transition point in an organization's network to safeguard against unauthorized access and other security risks.
Step-by-step explanation:
The importance of the LAN-to-WAN domain to an organization's security is significant because it acts as the boundary between the internal network (the Local Area Network, or LAN) and the external network (the Wide Area Network, or WAN). The correct statement that illustrates this importance is 'LAN-to-WAN connections expose internal systems to external threats.'
This is because the LAN-to-WAN connection is where the secure internal networks interact with the larger, more public networks like the internet. Without proper security measures, such as firewalls, intrusion detection systems, and strict access controls, the internal systems become vulnerable to a wide range of security risks, including unauthorized access, data breaches, and malware infections. Organizations must therefore carefully manage and secure their LAN-to-WAN connections to protect their data and systems.