60. How does the passage distinguish the composition of fire door windows from standard glass?
(A) They utilize ceramic or borosilicate glass to achieve superior thermal resistance.
(B) They are reinforced with a coating of vinegar and alum to prevent combustion.
(C) They are encased in clay and steel to withstand the high temperatures of a building fire.
(D) They are manufactured using the same endothermic properties as gypsum-based pressed sheets.