Where and what are the two bits that allow the user to differentiate the conditions of unmaskable INT is coming from: WDT Overflow $($Timeout$),$ Power ON RESET, WDT wake up from SLEEP, or WDT Wakeup? $(10$ Points$)$

What information and where are the bits that tell you$/$user$/$designer that $(1)$ the MCU system is coming from Power On RESET and $(2)$ the MCU is woke up by WDT time out? $(10$ Points$)$