these are three exe that will be listed in services.msc.
yes, you are correcthere are lot many exe under ,C:\Program Files\Symantec\Symantec Endpoint Protection\12.1.xxxxxx..\Bin folder , i can name few
smcgui.exe - system tray icon
doscan.exe - for command line scanning
devviewer.exe - to identify device id which is helpful for ADC policy