Final answer:
The Account lockout threshold determines the number of failed login attempts before a lockout occurs.
Step-by-step explanation:
The account lockout policy setting that determines the number of failed login attempts before a lockout occurs is the Account lockout threshold.
This setting specifies the maximum number of failed login attempts a user can make before their account is locked.
For example, if the account lockout threshold is set to 5, and a user enters an incorrect password 5 times, their account will be locked and they will not be able to log in until the lockout is lifted or the account is manually unlocked by an administrator.