What is a Continuous Descent Final Approach (CDFA) technique on a non-precision approach?

1. A technique where the aircraft flies a stabilized continuous vertical profile from the FAF down to the decision altitude/height, eliminating the traditional 'dive-and-drive' step-down level segments to enhance safety.
2. A high-speed dive directly to the runway threshold.
3. A circling maneuver performed at 500 feet AGL.
4. An unpowered gliding descent with both engines shut down.