What is wrong with the code fragment: $.$ORIG x$3000$ AND R$0,$R$0,$ #$0$ AND R$2,$R$2,$ #$0$ ADD R$2,$R$2,$ #$7$ JSR SUB ADD R$2,$R$2,$ ASCII ADD R$0,$R$2,$#$0$ TRAP x$21$ SUB ADD R$2,$R$2,$#$9$ ADD R$7,$R$7,$#$1$ RET ASCII $.$FILL x$0030.$END Group of answer choices We are modifying the contents of register R$7.$ This destroys the linkage back to the calling program. Nothing is wrong, the program outputs $16$ We are adding the x$0030($ascii code for $0),$ which is unnecessary. TRAP x$21$ will not work after a subroutine call.