3. a) The above diagrams describes pianos for sale. The terms should be obvious, except perhaps for a "piano type," which is something like "Baby Grand" or "Upright." Translate the above diagram to database schema design, using the "E/R" approach to handle the ISA hierarchy. (10) (type length Piano type name (addr Manf height width By Of Piano model (price isa processor Electronic Traditionalwood ower