Which service is responsible for managing data transmission over networks?

The correct response identifies the role of network connections in managing data transmission over networks. Network connections are essential for facilitating the transfer of data between devices across various types of networks, including local area networks (LANs) and the internet. This encompasses establishing connections, maintaining the integrity of data packets during transmission, and ensuring that communication protocols are followed for successful data exchange.

In contrast, the other options focus on different aspects of system operations. File operations involve managing files on storage systems, which does not directly pertain to data transmission over networks. Process scheduling is concerned with the management of processes within an operating system and how they are allocated CPU time, which is unrelated to network data transmission. Lastly, memory management deals with the allocation and use of computer memory resources, ensuring efficient bandwidth utilization, but it does not govern how data travels over a network. Thus, the emphasis on network connections clearly connects to the core function of managing data transmission, making it the correct choice.