77. Sleep Modes Operation

Question.7

Sam wants his Arduino UNO (ATmega328P) to wake up from Power-down sleep mode using a Timer2 interrupt. Which Timer2 setup will work for this?

Timer2 in CTC mode with internal clock (uses OCR2A for compare match)
Timer2 in Normal mode with internal clock (keeps counting and overflows)
Timer2 in Asynchronous mode with a 32.768 kHz crystal
Timer2 in Asynchronous mode with an 8 MHz crystal

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