Which of the following is true regarding the manual extension of the landing gear?

The statement that manual extension of the landing gear requires pumping the manual extension handle throughout landing and taxi is accurate. This process is necessary because the landing gear must be properly extended to ensure that the aircraft is ready for landing. The manual extension mechanism typically involves a hand pump or lever that needs to be operated repeatedly to allow the landing gear to move from its stowed position to the extended position.

In contrast, the other options do not align with the characteristics of manual gear extension. Automatic indication of green lights does not occur since the lights usually reflect the position of the gear based on hydraulic pressure or mechanical linkages rather than manual input. Additionally, while a manual extension may work effectively, it is not typically the sole method relied upon for guaranteed deployment; rather, it serves as a backup if automatic systems fail. The approach angle would not remain unaffected; the deployment of the landing gear can influence drag and affect overall flight dynamics, possibly altering the angle of descent.