<prompt> Rotation of a distal extension base around longitudinal axis is resisted byRigidity of major connectorRigidity of minor connectorBoth of the aboveNone of the above  <response>: A second movement is rotation about a longitudinal axis as the distal extension base moves in a rotary direction about the residual ridge. This movement is resisted primarily by the rigidity of the major and minor connectors and their ability to resist torque. 