Final answer:
CDX is an exterior grade plywood known for its durability against moisture and is commonly used in construction for roofing or wall sheathing. It should not be confused with OSB or paint grade plywood. the correct option is (a).
Step-by-step explanation:
The term CDX refers to a type of plywood that is used in the building and construction industry. CDX plywood is an exterior grade plywood with a C-grade face, D-grade back, and X indicating that it is bonded with exterior glue, which makes it suitable for outdoor use or use in environments where it is likely to be exposed to moisture. The C and D grades refer to the quality of the surfaces on either side of the plywood, with C being capable of having some defects that have been filled in and D having more and larger defects and knotholes.
It's commonly used for roofing or wall sheathing applications since it's manufactured to withstand environmental elements. Because of its composition and bonding, CDX is not typically used for decorative purposes, hence ‘Paint grade plywood’ would not be a correct description of CDX. Additionally, CDX is different from Oriented Strand Board (OSB), which is another common type of construction panel made of compressed wood strands.