$[6$ pts$]$ Describe the potential problems in the following statements and suggest how they could be remedied:

$($I$)$ ADD R$1,$ R$2,$ #$300$

$($II$)$ ADD R$3,$ R$4,$ #$-260$

$($III$)$ LD R$2,$ XA$420$BE

$[5$ pts$]$ The following program adds the values stored in memory locations A$,$ B$,$ and C and stores the result into memory. There are two errors in the code. For each, describe the error and indicate whether it will be detected at assembly time or at run time.

Line No$.$

$\backslash$table$[[1,,$ORIG x$3000],[2,$ONE,LD RO$,$ A$],[3,,$ADD R$1,$ R$1,$ RO$],[4,$TWO,LD RO$,$ B$],[5,,$ADD R$1,$ R$1,$ RO$],[6,$THREE,LD R$0,$ C$],[7,,$ADD R$1,$ R$1,$ RO$],[8,,$ST R$1,$ SUM$],[9,,$TRAP $25]]$

$10$ A

$.$FILL $x0001$

$11$ B

$.$FILL $x0002$

$12$ C

$.$FILL X$0003$

$13$ D

$.$FILL x$0004$

$14$

$.$END