Which type of cable must be flame-retardant, moisture-resistant, fungus-resistant, and corrosion-resistant?

The correct answer, which is NMC (Non-Metallic Sheathed Cable), is designed with specific characteristics that meet stringent safety and durability standards. NMC cables are commonly used in residential and commercial applications primarily due to their resistance to moisture, making them suitable for a variety of environments, including those prone to dampness.

Additionally, NMC cables are required to be flame-retardant, which minimizes the risk of fire spreading in case of an electrical short, providing a higher level of safety. They also include treatments to resist fungus growth, which is important in preventing degradation in humid conditions. Furthermore, NMC is designed to withstand corrosion, adding to its longevity and reliability when installed in environments that may expose it to moisture and other damaging elements.

The other choices, while they might possess some useful features, do not meet the comprehensive set of criteria that NMC covers, particularly when it comes to moisture and fungus resistance in conjunction with flame-retardant properties.