The network manager should use an Access Control List (ACL) to control the traffic between the segments. An ACL is a network filter that can be used to control the flow of network traffic based on various criteria, such as the source or destination of the traffic, the type of traffic, or the port number. By configuring an ACL, the network manager can specify which types of traffic are allowed to pass between the network segments and which are not. This will help to prevent unauthorized or malicious traffic from passing between the segments and potentially compromising the network. A DMZ, VPN, or VLAN would not be appropriate for controlling the traffic between the segments in this scenario.

A clean desk policy is a set of rules that require employees to clear their desks of any documents, papers, or devices that contain sensitive or confidential information when they leave their workstations. This policy helps to prevent unauthorized access, theft, or disclosure of proprietary information during facility tours or other situations where outsiders may visit the premises.
A . Clean desk policy. This is the correct answer, because a clean desk policy is a simple and effective way to mitigate the risk of exposing proprietary information during facility tours.

Explanation
The last incremental backup that was conducted 72 hours ago would be the best option to restore the services to a secure state, as it would contain the most recent data before the ransomware infection. Incremental backups only store the changes made since the last backup, so they are faster and use less storage space than full backups. Restoring from an incremental backup would also minimize the data loss and downtime caused by the ransomware attack. References:
https://www.comptia.org/blog/mature-cybersecurity-response-to-ransomware
https://www.youtube.com/watch?v=HszU4nEAlFc