Interface circuits:
Interface circuits are electronic circuits that provide a connection between different devices or components. They allow for the transfer of data, signals, or power between these devices. In the context of this question, interface circuits serve as an intermediary between the device and the buses.

Device drivers:
Device drivers are software programs that allow the operating system to communicate with hardware devices. They provide a way for the device and the operating system to interact with each other. While device drivers are necessary for the proper functioning of devices, they are not directly involved in serving as intermediaries between the device and the buses.

Buffers:
Buffers are temporary storage areas that hold data while it is being transferred between devices or components. They act as a bridge between two devices, allowing them to exchange data at different speeds or with different characteristics. While buffers are involved in data transfer, they are not specifically designed to serve as intermediaries between the device and the buses.

Explanation:
In the context of the given question, interface circuits are the correct option for serving as intermediaries between the device and the buses. Interface circuits are designed to facilitate communication between the device and the buses by providing the necessary electrical connections and protocols. They convert the signals from the device into a format that can be understood by the buses and vice versa.

Interface circuits act as a bridge between the device and the buses, allowing data, signals, or power to be transferred between them. They ensure compatibility and proper communication between the device and the buses by handling the electrical and protocol conversions. Without interface circuits, the device would not be able to communicate with the buses effectively.

Interface circuits can be found in various electronic devices, such as computers, smartphones, printers, and many others. They play a crucial role in enabling the devices to connect and communicate with the buses, which are essential for their proper functioning.

In conclusion, interface circuits serve as intermediaries between the device and the buses by providing the necessary electrical connections and protocols. They enable communication and data transfer between the device and the buses, ensuring compatibility and proper functioning.