How is the result displayed after using the Intoxilyzer 9000?

The correct answer reflects that the Intoxilyzer 9000 provides its results through a digital screen. This screen displays the blood alcohol concentration (BAC) level obtained from the breath sample, along with messages that can indicate the status of the test or any specific instructions. The digital format allows for clear visibility and immediate access to the BAC information, which is essential for law enforcement to make informed decisions.

Using a printed paper receipt, while it could provide a record of the results, is not how the primary result is initially conveyed to the operator. Similarly, sound signals like beeps or visual indicators such as flashing lights may serve operational purposes but do not explicitly communicate the specific BAC level, which is crucial to the testing and subsequent legal processes. Therefore, the digital screen is the primary and most informative way results are presented after using the Intoxilyzer 9000.