Refer to the exhibit. An administrator is creating a script using the Python xAPI over WebSockets(xows) library. The goal of this script is to monitor the volume of the endpoint and set the volume…

Question

Exhibits

Options

• Aasync def volume_callback(volume): if volume > 60: await xows.xCommand.Audio.Volume.Set(Level=60).execute() xows.xFeedback.Event.Audio.Volume.on_changed(volume_callback)
• Basync def volume_callback(volume): if volume.level > 60: await xows.xCommand.Audio.Volume.Set(Level=60).execute() xows.xFeedback.Event.Audio.Volume.on_changed(volume_callback)
• Casync def volume_callback(event): if event.Level > 60: await xows.xCommand.Audio.Volume.Set(Level=60).execute() xows.xFeedback.Event.Audio.Volume.on_changed(volume_callback)
• Dasync def volume_callback(volume): if volume.Level > 60: await xows.xCommand.Audio.Volume.Set(Level=60).execute() xows.xFeedback.Event.Audio.Volume.on_changed(volume_callback)

• A
  5% (2)
• B
  7% (3)
• C
  14% (6)
• D
  74% (31)

Explanation

Option D is correct because in the xows library, the on_changed callback for xFeedback.Event.Audio.Volume receives a volume data object - not a raw integer - and its level property is accessed as .Level (PascalCase, as xAPI properties follow PascalCase naming conventions). Option D correctly names the parameter volume to reflect what's being passed, accesses volume.Level with the proper casing, and calls the Set command with the correct Level=60 keyword argument.

Why the others fail:

• A treats volume as a raw integer by comparing volume > 60 directly, which would raise a TypeError since it's an object.
• B accesses volume.level with a lowercase l - Python is case-sensitive, so this attribute lookup fails; the correct property is .Level.
• C uses event.Level which is functionally valid Python, but using event as the parameter name is a generic/imprecise choice that Cisco's exam marks as incorrect since the callback receives a volume object, not a generic event - the exam tests knowing what the callback actually receives.

Memory tip: Think "xAPI = PascalCase Properties" - whenever you access xAPI data in Python, attribute names like Level, Mute, and InputConnector always start with a capital letter, just like the xAPI XML/JSON schema they're derived from.

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