<prompt> True about precision attachment:One intracoronal preparation in tooth one integrated into RPD prosthesis to stabilize and or retain itOne intracoronal preparation in tooth one removable attachment to prosthesisOne intracoronal fixed on abutment one integrated into RPD prosthesis to stabilize and or retain itAll of the above  <response>: Internal attachment precision attachment - Means interlocking device, one component of fixed into an abutment or abutments other integrated to a removable prosthesis to stabilize andor retain itSemipresicion rest- Rigid metallic extension of a fixed or RPD fits into an intracoronal preparation in a cast restoration. 