setDescription(String str) and setUnit(int num) are the mutor methods of class Inventoryltem void setDescription (String str) void setDescription (String str) Description = str; Description = str; The following statement creates an Inventoryltem array: Inventoryltem[] items = new Inventoryltem[5]; Is it correct or not to execute the following statements? If it is not correct, write the correct one a. items[0].setDescription("Hammer"); b. items.setUnit