Which of the following is a primary characteristic of AC cable?

Armored protection is a primary characteristic of AC (Alternating Current) cable, particularly in certain applications where increased durability and mechanical protection are necessary. AC cables are designed to transmit electrical power efficiently, and when armored, they are fortified with an outer metal layer that provides resistance to physical damage and environmental factors. This feature is especially important in industrial and outdoor settings where the cables may be exposed to potential hazards such as impact, moisture, or chemicals.

The other characteristics listed, such as non-metallic properties, liquid-tight construction, and telecommunication use, do not primarily define AC cables. For example, while some cables might be non-metallic or liquid-tight, these attributes are not exclusive to AC cables. Similarly, telecommunication cables are typically designed for data transmission rather than power delivery and do not fall under the primary characteristics of AC cables.