Which group represents only static features of today's audio/video receivers?

The choice that accurately reflects only the static features of today's audio/video receivers is centered around the functionalities that are inherent to the hardware and design of the devices. Surround sound decoding, image rescaling, and the various audio and video inputs and outputs are foundational components, meaning they are typically built into the receiver and define its core operational capabilities.

Surround sound decoding is crucial because it determines how the receiver processes multi-channel audio formats, enabling users to experience immersive sound. Image rescaling is important for ensuring compatibility with various video resolutions, allowing devices to display content correctly on different screens. Additionally, audio and video inputs and outputs are essential ports that facilitate connections to other devices, playing a key role in functionality without relying on external software or updates.

In contrast, the other options include features that are either dynamic or reliant on software, such as streaming capabilities, networking features, and user interface customization, which can change with updates or user preferences. Thus, the correct choice highlights features that represent the inherent, unchanging aspects of audio/video receivers.