Which of the following sequences of AVR assembly language instructions would make a suitable interrupt service routine which reads a byte from IO register PINA, inverts it and outputs the value to PORTC? (The values in the status register and all general purpose registers must be preserved.)

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a..def temp = r16 int0: in temp, POR com temp out PORTC, temp reti b..def temp = r16 int0: push SREG push temp in temp, PINA com temp out PORTC, temp pop temp pop SREG reti C..def temp = r16 int0: push SREG push temp in temp, PINA com temp out PORTC, temp pop SREG pop temp reti d..def temp = r16 int0: push temp in temp, SREG push temp in temp, PINA com temp out TC, temp pop temp pop temp out SREG, temp reti e. None of the above a..def temp = r16 int0: in temp, POR com temp out PORTC, temp reti b..def temp = r16 int0: push SREG push temp in temp, PINA com temp out PORTC, temp pop temp pop SREG reti C..def temp = r16 int0: push SREG push temp in temp, PINA com temp out PORTC, temp pop SREG pop temp reti d..def temp = r16 int0: push temp in temp, SREG push temp in temp, PINA com temp out TC, temp pop temp pop temp out SREG, temp reti e. None of the above