Workstations in an air$-$gapped network are used by an organization's research department. Based on files from the research department, a competitor has created some products. Which of the following actions should management take to ensure that research files are secure and confidential?

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Implement multi factor authentication on the workstations.

Configure removable media controls on the workstations.

Install a web application firewall in the research department.

Install HIDS on each of the research workstations.