Which of the following is NOT a likely cause of Wi-Fi signal interference?

Wi-Fi signal interference typically occurs when different devices use overlapping frequencies or when physical barriers hinder signal propagation. Microwave ovens, for instance, operate on frequencies that can disrupt Wi-Fi signals, usually around 2.4 GHz. Wireless cameras often operate in the same frequency range as Wi-Fi, leading to potential interference as well. Concrete walls can significantly weaken or block Wi-Fi signals because they are dense materials that impede radio waves.

In contrast, Bluetooth devices don't typically cause interference with Wi-Fi networks because they operate in the same frequency range (2.4 GHz) but use different modulation methods and protocols that minimize cross-interference. Bluetooth is designed for short-range communication and often employs frequency hopping spread spectrum techniques to avoid conflicts with other devices. This allows Bluetooth to coexist with Wi-Fi networks without significantly affecting their performance. Therefore, while the other options are well-known for contributing to Wi-Fi interference, Bluetooth devices are less likely to be a cause of such issues.