Problem 4: (20 points) The figure below is an E/R diagram about pianos, their manufac types are Grand, l": some types. A typical manufacturer could be Steinway or Casio. Typical names of Baby-Grand, Spinet, and (electronic) Keyboard. Pianos could be both, and some could be n made, and for electronic pianos, we record the processor used and the power. are either electronic or "traditiona either. For traditional pianos we record the wood from which it is addr Piano ype Mand OF Piano model Elertronic a) Convert this E/R diagram to a relational database schema, using the "E/R" approach to handling the isa-hierarchy b) Convert the same E/R diagram to a database schema using the "object-oriented" approach to handling the isa-hierarchy