A curtain wall is typically used in buildings whose structural system consists of a
a. load-bearing masonry wall structure
b. load-bearing reinforced-concrete wall structure or load-bearing masonry wall structure
c. reinforced-concrete frame structure or steel-frame structure
d. steel-frame structure or load-bearing masonry wall structure
e. all of the above
Answer: c. reinforced-concrete frame structure or steel-frame structure
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