A building management notice reads: '本大樓電梯將於本週六進行例行保養，保養期間（上午八時至中午十二時）請改走樓梯。' What are residents advised to do?
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A
Avoid entering the building entirely on Saturday morning
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B
Use the stairs between 8 AM and noon on Saturday during elevator maintenance
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C
Contact building management to schedule a personal elevator time slot
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D
Expect elevator service to be permanently discontinued