Liquid tight flexible nonmetallicconduit is subject to which of thefollowing limitations?cannot be used in direct sunlight,unless marked for this applicationcan become brittle in extremely coldtemperaturescannot be direct-buried, except whenmarked for this applicationall of these

The question is asking about the limitations of liquid tight flexible nonmetallic conduit (LFNC). LFNC is a type of electrical conduit made from a flexible plastic material that is resistant to liquids. It is often used in wet or corrosive environments.The first limitation mentioned is that LFNC cannot be used in direct sunlight unless it is specifically marked for this application. This is because the ultraviolet (UV) radiation from the sun can degrade the plastic material over time, causing it to become brittle and potentially fail.The second limitation is that LFNC can become brittle in extremely cold temperatures. This is due to the properties of the plastic material used in LFNC. When exposed to very cold temperatures, the plastic can become less flexible and more brittle, which can lead to cracking or other failures.The third limitation is that LFNC cannot be direct-buried, except when marked for this application. This is because the plastic material may not be able to withstand the pressure and moisture conditions present in a direct burial application. However, some types of LFNC are specifically designed and marked for direct burial use.Considering all these points, the correct answer is 'All of these'. All the mentioned limitations are applicable to liquid tight flexible nonmetallic conduit.Liquid tight flexible nonmetallic conduit (LFNC) has several limitations. It cannot be used in direct sunlight unless marked for this application, can become brittle in extremely cold temperatures, and cannot be direct-buried unless marked for this application. Therefore, the answer is 'All of these'.