Problem 4: (20 points) The figure below is an E/R diagram about pianos. types. A typical manufacturer s and could be Steinway Baby-Grand. S could be both, and some could be pinet, and (electronic) Keyboard, Pianos are either electronie or way or Casio. Typical names of types are Grand neither. For traditional pianos we record the wood from which it is made, and for electronic pianos, we record the processor used and the power Plane Piaso Traditional ) Convert this E/R diagram to a relational database schema, using the "E/R" approach to handl e isa-hierarchy. vert the same E/R diagram to a database schema using the "object-oriented" app g the isa-hierarchy