The following LC-3 instructions execute starting from the point shown by the comment.

; start LC-3 execution here

0101 011 011 1 00000

0001 100 011 1 01000

0001 011 011 1 00001

0001 100 100 0 00 100

0000 101 111111101

; end LC-3 execution here

After the code reaches the end of the code (the last comment), what bits are held in R3? And in R4? If you cannot know the bits held, explain why.