A sign reads: "Parking in this lot is for authorized vehicles only. Unauthorized vehicles will be towed at the owner's expense. Monthly parking permits are available from the building management office. Hours of operation: 6 AM to 11 PM." Who may park in this lot?
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A
Any member of the public
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B
Vehicles with a valid monthly permit or authorization
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C
Only building management staff
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D
Delivery vehicles during business hours