The correct answer is crenellations, which are notched parapets on castle walls that allowed defenders to fire weapons at enemies while remaining protected. Other options like trusses, columns, and arches serve different architectural purposes and are not specifically designed for defense. Crenellations were crucial for medieval fortifications. ;
The correct answer is crenellations, which are notched structures on castle walls allowing defenders to fire weapons while staying sheltered. They were essential to medieval castle fortifications. Other options, like trusses, columns, and arches, serve different architectural roles and are not specifically for defense.
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