Which of the following $\square$ generates a uniformly random permutation of an array $A$ of size $n$ in place, assuming that RANDOM($\ell, r$) returns an integer chosen uniformly at random from $\{\ell, \ell+1, \dots, r-1, r\}$?

RANDOM-PERMUTE(A) 1 for i = 1 to n 2 □ 3 if a <= b 4 swap A[i] with A[RANDOM(a,b)]