Which statement best differentiates a confined aquifer from an unconfined aquifer?

Which statement best differentiates a confined aquifer from an unconfined aquifer?

• A. Confined aquifers have no water; unconfined have water table.
• B. Confined aquifers are only in deserts; unconfined are in wetlands.
• C. Confined aquifers are always artesian; unconfined never.
• D. A confined aquifer is bounded above and below by impermeable layers and is typically under pressure; an unconfined aquifer has an exposed water table and recharge occurs directly from the surface.

Answer: (D)