Correct Answer: A, C, ETo prevent users from launching multiple sessions of the same published application by rapidly clicking an application icon, a Citrix Engineer can configure the multi-launch timeout setting. The three methods to do this are: 1) configuring the Group Policy Object settings for Remote Desktop Session Host, 2) using PowerShell commands with Citrix snap-ins, and 3) configuring Citrix policy settings directly. These methods allow for precise control over session management settings, including preventing rapid session launches.