What feature does the AirPort Time Capsule utilize to reduce interference?

The feature that the AirPort Time Capsule utilizes to reduce interference is based on its use of multiple antennas. This technology, often referred to as Multiple Input Multiple Output (MIMO), allows the device to communicate with multiple wireless devices simultaneously while managing and reducing interference from other signals. By using multiple antennas, the Time Capsule can better manage the wireless spectrum and optimize the connection quality for each device based on its position and environment. This enables a more stable and robust wireless experience, which is essential for tasks that involve backing up data over a network.

The other choices do not effectively describe how the AirPort Time Capsule addresses interference. While broadcasting in waves is a fundamental aspect of any wireless communication, it doesn't specifically reduce interference. Pinpointing wireless devices refers more to network management capabilities rather than direct interference reduction. Operating without a power source isn't relevant to wireless performance or interference management. Therefore, using multiple antennas stands out as the correct answer by directly relating to the AirPort Time Capsule's ability to mitigate interference.