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QUESTION 4 Assume that class Furniture has following two private data fields: private String name; private int code; and the following method, in addition to other methods: public String toString() { return name + code; } Now, we want to write a class called Dining Set that inherits the properties of class Furniture as follows, having only one data field: public class DiningSet extends Furniture { private int sittingCapacity; We want to include a method toString in class Dining Set to create a String representation of the object, including all attributes. It can be written as follows: a. public String toString() { return this.toString() + sittingCapacity; } b. public String toString() { return super.toString() + sittingCapacity; } OC. public String toString() { return Furniture.toString() + sittingCapacity; } O d. public String toString() { return name + code + sittingCapacity; }