<prompt> According to Schilder, mechanical objective of cleaning and shaping isare:Canal should continuously taperCanal should be prepared in multiple planeApical construction should be as small as possibleAll of the above  <response>: Schilders Mechanical Objectives of Cleaning and Shaping:The root canal preparation should develop a continuously tapering cone.Making the preparation in multiple planes which introduces the concept of flow.Making the canal narrower apically and widest coronally.Avoid transportation of the foramen.Keep the apical opening as small as possible. 