A material whose perm rating in the U.S. system of units is 0.5 perm is a
A) Class IV vapor retarder.
B) Class I vapor retarder.
C) Class III vapor retarder.
D) Class II vapor retarder.
E) none of the above.
D) Class II vapor retarder.
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Fill in the blank(s) with the appropriate word(s).