How do hydraulic and pneumatic systems differ in terms of fluid, compressibility, and typical applications?

• A. Hydraulic uses incompressible oil for high force; pneumatic uses compressible air for motion and light loads
• B. Hydraulic uses air; pneumatic uses oil
• C. Both use oil; compressibility differences are negligible
• D. Pneumatic provides high force; hydraulic is for precision measurements

Answer: (B)