An organization wants to prohibit certain users from saving any type of data from their virtual desktops to client devices after business hours. After business hours are 5PM till 9AM. How can this be achieved?

VMware Dynamic Environment Manager (DEM) with Horizon Smart Policies is the correct solution. It allows administrators to create context-aware policies that can be triggered based on various conditions, including the time of day. An administrator can configure a policy to disable features like Client Drive Redirection or Clipboard Redirection and apply a "Time of day" condition to activate this policy only between 5 PM and 9 AM, thus meeting the requirement.

A. Blocking a port is a network-level control that would likely disrupt the entire user session, not granularly control data transfer features based on time.
B. Standard Active Directory Group Policy Objects (GPOs) are not inherently time-aware; they apply statically and cannot dynamically change based on the time of day.
C. Directly editing the registry on virtual desktops is a static configuration and does not provide the required time-based dynamic control.

1. VMware Docs, Administering VMware Dynamic Environment Manager, Version 2111, "Horizon Smart Policies Conditions". The documentation lists "Time of day" as a supported condition, stating it can be used to "specify a time range during which the Horizon Smart Policies settings are applied."

2. VMware Docs, Configuring Remote Desktop Features in Horizon 8, Version 2203, "Configuring Horizon Smart Policies". This section explains that Smart Policies control the behavior of features such as clipboard redirection and client drive redirection, which are the mechanisms for saving data to client devices.