In a system,each user has an entry in the system's password file:$($y$,$s$)$where y iscomputed as follows and s is a salt.

i$.$y$=$H$($password$,$s$)$ where H is SHA$-1$

ii$.$y$=$H$($s$,$password$)$password

iii.y$=$H$($s$)$H$($password$)$

iv$.$y$=$E$($s$,$password$)$where E is AES and the first input of E is the key

v$.$y$=$E$($password$,$s$)$

vi$.$y$=$E$($s$,$H$($password$))$

vii.y$=$MAC$($s$,$password$)$where MAC is HMAC and the first input of MAC is the key

viii. y$=$MAC$($password$,$s$)$

List which of the methods above for computing y are secure against$($precomputed$)$dictionary attack.Assume that s is $40$ bits long and randomly chosen.