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What type of material is shown in the following photo?

Different types of material are built into walls and other constructs of various types of buildings and facilities. What type of material is shown in the following photo?

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A.
Fire-resistant material

B.
Light frame construction material

C.
Heavy timber construction material

D.
Rebar material

Explanation:
D: Calculations of approximate penetration times for different types of explosives and attacks are based on the thickness of the concrete walls and the gauge of
rebar used. (Rebar refers to the steel rods encased within the concrete.) So even if the concrete can be damaged, it will take longer to actually cut or break
through the rebar. Using thicker rebar and properly placing it within the concrete provides even more protection. Reinforced walls, rebar, and the use of double
walls can be used as delaying mechanisms.
A is incorrect because a building could be made up of incombustible material, such as steel, which provides a higher level of fire protection but loses its strength
under extreme temperatures, something that may cause the building to collapse. This type of material has to do with the reduction of time and amount of fire
damage instead of the difficulty of getting through a wall. The photo illustrates rebar, which is a material that reinforces the strength of walls.
B is incorrect because light frame construction material is not illustrated in this photo. Light frame construction is composed of untreated lumber and is usually
used to build homes, primarily because it is cheap but also because homes typically are not under the same types of fire and intrusion threats that office buildings
are. The photo illustrates rebar, which is a material that reinforces the strength of walls.
C is incorrect because heavy timber construction material is not illustrated in this photo. Heavy timber is commonly used for office buildings. The photo
illustrates rebar, which is a material that reinforces the strength of walls.

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