Memory locations $1000,1004$ and $1008$ contain the data $10,20$ and $30$ respectively. If register $r1$ is initialized with the value $1000,$ the contents of register $r2$ after execution of the following code segment will be

LDR $,5,[r1]$

LDR $r6,[x1,$#$4]$

LDR $,x7,[x1,$#$8]$

ADD $,x2,x5,x6$

SUB $,x2,x2,x7$