Introduction:
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless communication technology that provides high-speed internet access over long distances. It operates on radio waves and offers a wider coverage area compared to other wireless technologies.

Subscriber Stations:
- Subscriber stations, also known as Customer Premises Equipment (CPE), are devices that provide connectivity to a WiMAX network.
- These devices are typically installed at the customer's location, such as homes or offices, and act as the interface between the customer's devices (e.g., computers, smartphones) and the WiMAX network.
- Subscriber stations connect to the base stations, which are located within the WiMAX network infrastructure.

Base Stations:
- Base stations are another essential component of a WiMAX network.
- They are responsible for transmitting and receiving signals to and from subscriber stations.
- Base stations are strategically placed throughout the coverage area to ensure a reliable connection for all subscribers.
- These stations are connected to the core network infrastructure, which enables data transfer between the subscriber stations and the internet.

Gateway:
- The gateway is a network component that allows communication between different networks or protocols.
- In the context of WiMAX, gateways are used to connect the WiMAX network to other networks, such as the internet or a private network.
- Gateways handle the conversion of data between different protocols, ensuring compatibility and seamless communication.

Conclusion:
In summary, devices that provide connectivity to a WiMAX network are known as subscriber stations or Customer Premises Equipment (CPE). These devices are installed at the customer's location and act as the interface between the customer's devices and the WiMAX network. Base stations, on the other hand, are responsible for transmitting and receiving signals to and from the subscriber stations. Gateways are used to connect the WiMAX network to other networks and handle the conversion of data between different protocols. Therefore, the correct answer is option 'A' - subscriber stations.