Which sketch entity has options to maintain continuous curva
     Which sketch entity has options to maintain continuous curvature?  Fillet  Ellipse  Parabola  Spline 
  
  Solution
d. Spline.
Spline is a tool which is used to sketch or draw spline (curve) on the sketch graphics area. This tool helps to add spline points and join line between them.
After that, one can adjust the spline point positions, curve angles etc.

