How is cabin pressurization controlled on the E-190 and which component regulates cabin differential pressure?

How is cabin pressurization controlled on the E-190 and which component regulates cabin differential pressure?

• A. Manually by the crew with no automatic control.
• B. By a fixed differential pressure valve with no feedback.
• C. Automatically by the cabin pressure controller using outflow valves to maintain the scheduled differential pressure; manual backup is available.
• D. By the air conditioning pack flow alone.

Answer: (C)