do part a and b

3. Consider the partial hierarchy of orchestra instruments given below. The following functionality is defined for all orchestra instruments. - A specific instrument (BrassInstrument or PercussionInstrument) has one piece of information, an orchestra seat assignment, which is passed as a string to its one-parameter constructor. This seat assignment can be publicly accessed and can be changed after the instrument is created. - All instruments tune but they tune in very different ways. Percussion instruments may adjust the tension of the drumhead while brass instruments may tune a middle G first. Bacause a PercussionInstrument is a kind of Instrument and a BrassInstrument is a kind of Instrument, BrassInstrument and PercussionInstrument implement the Instrument interface. a) Write the Instrument interface that abstracts this functionality b) Write the complete class definition for BrassInstrument. In writing your class, you should - Choose appropriate method and variable names - Provide the functionality specified above