You are given the following interrupt service routines. We assume the INT$0$ and INT$1$ interrupts have already been enabled $($code not shown$).$ The hexadecimal numbers on line $812$ and $1518$ are the program addresses of the corresponding instructions.

$.$ORG $0$x$0002$ ; INT$0$ interrupt vector

RJMP S$0$

$.$ORG $0$x$0004$ ; INT$1$ interrupt vector

RJMP S$1$

S$0$: ; interrupt service routine for INT$0$

$0$x$1000$: LDI R$21,0$xFF

$0$x$1001$: OUT DDRC$,$ R$21$

$0$x$1002$: LDI R$20,15$

$0$x$1003$: OUT PORTC, R$20$

$0$x$1004$: RETI

S$1$: ; interrupt service routine for INT$1$

$0$x$1005$: LDI R$21,0$xFF

$0$x$1006$: OUT DDRD$,$ R$21$

$0$x$1007$: LDI R$20,32$

$0$x$1008$: OUT PORTD, R$20$

$0$x$1009$: RETI

When INT$0$ first occurs, what is the consequent value in the program counter $($PC$)$ right after the interrupt?

Group of answer choices

$0$x$1004$

$0$x$0004$

$0$x$1005$

$0$x$0002$

$0$x$1000$