1. Give an example of polymorphism. Write a method in C# in a base class so that it can be overridden in a derived class, and provide/write that method. (Should only contain two methods)

2. Consider the following section of code from the definition of class OfficeBuilding.

public class OfficeBuilding
{
public int sqrFeet;
private string name;
protected double cost;
public OfficeBuilding() { ... }
protected bool isBuilt(){ ... }
public void moveIn(){ ... }
public double rentSpace(){ ... }
private int renovate(int days) { ... }

a. Which members/methods are visible to (accessible from) OfficeBuilding and its subclasses?

b. Which members/methods are visible to (accessible from) only the OfficeBuilding class?

c. Which members/methods are visible to (accessible from) any class?