Computer networks – transmission media categories: Which types of data transmission channels are commonly recognized for carrying information from one location to another (by bandwidth classification and typical use cases)?

Introduction / Context:
Data communication channels are often grouped by their usable bandwidth and the applications they serve. Understanding the common categories helps you choose the right medium for telemetry, telephony, and high-speed data networking. This question checks recognition of the standard classifications: narrowband, voiceband, and broadband.

Given Data / Assumptions:

• Narrowband refers to very small bandwidth channels, typically used for low-rate telemetry or control signals.
• Voiceband typically refers to the traditional telephone channel bandwidth around 300 Hz to 3.4 kHz and technologies designed to operate in that band (for example, dial-up modems).
• Broadband refers to wideband channels capable of supporting high data rates, frequency division, or multiple services (for example, cable, fiber, microwave).

Concept / Approach:

Classification is not about the exact medium (copper, fiber, wireless) but about the bandwidth and services supported. If all three categories exist in practice for carrying data between locations, then the comprehensive answer is that all listed categories are viable channels.

Step-by-Step Solution:

Verification / Alternative check:

Cross-check with standard networking texts which consistently define these three categories based on bandwidth and typical use. Each has well-known technologies and protocols built to operate within their constraints.

Why Other Options Are Wrong:

a: Narrowband alone is incomplete; it omits voiceband and broadband.

b: Voiceband alone ignores other valid categories.

c: Broadband alone omits legacy and low-rate channels which still carry data.

e: Incorrect because all three are legitimate channel types used to carry data.

Common Pitfalls:

Equating classification strictly with medium (for example, copper vs fiber) rather than bandwidth; assuming legacy channels like voiceband can no longer carry data (they can, albeit at lower rates); or thinking broadband is the only modern option.

Final Answer:

All of the above