Final answer:
B.'msiexec /i Agent.msi ADDLOCAL=ALL REMOVE=SystemTrayIcon,StartMenuIcon', To hide the Agent in both the System Tray and Start Menu, use the command which is more likely to be correct for a standard MSI installation.
Step-by-step explanation:
To hide the Agent in both the System Tray icon and the Start Menu during installation using MSI install commands, you would need to provide the appropriate properties that instruct the installer to perform these actions. In the commands provided, B) msiexec /i Agent.msi ADDLOCAL=ALL REMOVE=SystemTrayIcon,StartMenuIcon is correct.
This command tells the MSI installer to install all the features of the application (ADDLOCAL=ALL) while removing the System Tray icon and the Start Menu icon from the installation. There are no standard MSI properties that are named /hideicontray or /hideiconstartmenu, which suggests that Command A) is likely incorrect or using a non-standard syntax.