Which statement differentiates a confined aquifer from an unconfined aquifer?

Which statement differentiates a confined aquifer from an unconfined aquifer?

• A. Unconfined aquifers are bounded above and below by impermeable layers
• B. Confined aquifers are directly connected to the atmosphere
• C. Unconfined aquifers have the water table well below the surface
• D. Confined aquifers are bounded by impermeable layers above and below; unconfined have the water table in contact with the surface

Answer: (D)