In computer systems, a device is said to be “online” when it is accessible to, or under the direct control of, the processor. Which term correctly fills the blank?

Introduction / Context:
Operating systems and hardware documentation distinguish between devices that are actively connected and controllable versus those that are offline or unavailable. The term “online” is standard in this context.

Given Data / Assumptions:

• The device can be addressed by the CPU and I/O subsystem in real time.
• It is powered, connected, and recognized by the system.
• We seek the conventional single-word descriptor.

Concept / Approach:
“Online” denotes that a resource is present and in service. In contrast, “offline” indicates detached, powered down, or otherwise unavailable for immediate control by the processor or OS.

Step-by-Step Solution:

Verification / Alternative check:
Manuals for storage, printers, and network devices use “online/offline” to indicate availability to the host.

Why Other Options Are Wrong:
“People,” “icons,” and “information system” do not describe device status. “None” is wrong because a standard term exists.

Common Pitfalls:
Confusing logical availability with simple physical connection; a connected device may still be offline logically if not enabled.

Final Answer:
on-line