Which statement best describes the difference in resource usage between Windows services and Unix-like daemons?

• A. Unix-like daemons run at all times, consuming more resources.
• B. Windows services run with higher privileges.
• C. Unix-like daemons run more processes.
• D. Windows services consume memory even when not in use, while Unix-like daemons do not impact system performance when idle.

Answer: (D)

When we compare how background processes use resources, the key idea is how they stay resident in memory when they’re not actively doing work. Windows services are managed by the Service Control Manager and typically stay loaded as active processes as soon as the system boots or when they’re started. That means they occupy memory even if they’re not currently handling a task, because the process and its state are kept ready to respond.

Unix-like daemons, on the other hand, are designed to run in the background and often operate in a way that uses resources only as needed. They usually wait for events or sleep when idle, and they tend to release or minimize substantial resource usage when there’s no work to do. This leads to less impact on overall system performance during idle periods.

So the statement aligns with the general behavior: Windows services tend to consume memory even when idle, while Unix-like daemons do not typically burden the system when there’s no activity. There are exceptions in practice—some services can be configured to start on demand, and daemon implementations can vary—but as a broad distinction, this is the best fit.