$6.$What task is performed by the following algorithm?A: array of numbers$0$low: lowest index of array Ahigh: highest index of array A$1234567891012$function X$($A$,$ low, high$)$ elem$=$A $[$high$]$i $=$ lowfor is j$<$ highif Aril elem thenswap $($A$[$i$],$A$[$j$])$i $=$ i $+1$end ifend for swap $($A$[$high$],$A$[$i$])$return i end function