Which of the following correctly describes brute-force password attacks?

A brute-force attack uses every possible combination of letters, numbers, and special characters against an authentication effort— whether in succession or (more commonly) at random. The drawbacks to its use are substantial: It takes the longest amount of time and a tremendous amount of processing resources. However, it is your best option on complex passwords, and there is no arguing its effectiveness: Given enough time, every password can be cracked using brute force. It may take years to try every combination, but if you keep at it long enough, it is successful 100 percent of the time.