Explanation
In order to exercise manual control over the sensor upgrade process, as well as prevent unauthorized users from uninstalling or upgrading the sensor, the administrator should set the Sensor version to fixed and turn on the Uninstall and maintenance protection setting in the Sensor Update Policy. This will allow the administrator to specify which sensor version will be used by the hosts using this policy, and also require a maintenance token to uninstall or upgrade the sensor. The other options are either incorrect or not sufficient to meet this criteria. Reference: CrowdStrike Falcon User Guide, page 38.

Explanation
When creating new IOCs in IOC management, the administrator must configure the Hash, Platform and Action fields. The Hash field is the value of the IOC, such as MD5, SHA1 or SHA256. The Platform field is the operating system that the IOC applies to, such as Windows, Linux or Mac. The Action field is the action that Falcon will take when detecting the IOC, such as Detect, Block or Allow. The other fields are either optional or not available. Reference: CrowdStrike Falcon User Guide, page 44

Explanation
An inactive host will remain visible within the Host Management or Trash pages for 90 days. An inactive host is a host that has not communicated with the Falcon platform for more than seven days. An inactive host will be moved from the Host Management page to the Trash page after seven days of inactivity. An inactive host will remain in the Trash page for 90 days before being permanently deleted from the Falcon platform. You can restore an inactive host from the Trash page if it becomes active again within 90 days1.
References: 1: Falcon Administrator Learning Path | Infographic | CrowdStrike

Explanation
The filter that could be used to quickly identify all devices categorized as a "Workstation" by the Falcon Platform on the Host Management page is Type. The Type filter allows you to filter hosts by their device type, such as workstation, server, or domain controller. The device type is assigned to each host based on their Active Directory domain structure. You can use the Type filter to quickly identify all hosts that have the workstation type assigned in their domain2.
References: 2: Cybersecurity Resources | CrowdStrike

Explanation
The administrator can assign a Prevention policy to one or more hosts by ensuring the hosts are in a group and assigning that group to a custom Prevention policy. This allows users to apply different prevention settings and options to different groups of hosts based on their needs and preferences. The other options are either incorrect or not applicable to assigning a Prevention policy. Reference: [CrowdStrike Falcon User Guide], page 34.