I have downloaded the file package "unified_bootloader_demo_V2.1", which includes three file packages: "S32K344_CAN_Bootloader_RTD2d0", "S32K344_APP_Demo_RTD2d0", and "S32K344_user_config". The first one is clearly a BOOTLOADER, but what are the purposes of the latter two files?And I compiled the first one. What should I do with the other two?