How many audio channels can be contained in one digital television audio bitstream?

The correct choice indicates that a digital television audio bitstream can typically contain multiple audio channels, specifically configured as 5.1. In the realm of digital audio formats, such as those used in broadcasting and home theater systems, 5.1 refers to a surround sound configuration that includes six discrete channels: one low-frequency effect (subwoofer) channel, which is denoted as ".1", and five channels for standard sound, typically arranged to create a surround sound experience. This configuration is widely used in both television broadcasting and home media systems to enhance the audio experience, allowing for directional sound that improves immersion.

While some other configurations like 2.0 (stereo) and 7.1 (which includes additional surround channels) exist, 5.1 is particularly notable in the context of digital television as it strikes a balance between complexity and enough channels to create a satisfying surround sound experience. The presence of higher channel configurations, such as 9.1, is less common in standard TV broadcasts and typically reserved for specialized digital audio formats or high-end home theater setups, which may not be relevant to all broadcasting contexts.