This question tests your understanding of decision trees. You can draw the portion of the decision tree for quicksort on $5$ elements $($a$1,$ a$2,$ a$3,$ a$4,$ a$5)$ to the leaf node annotated by the permutation $k25a4A5?$

$[Select]$

$a1a5?$

$a3a5?$

$a4a2?a2x=a1?$

$34x=a1?$

$2x=a5?$