Java's API for XML processing expects developers to use the following approach when parsing an XML document: Document BuilderFactory bf - Document BuilderFactory.newInstance(); Document Builder parser bf.newDocument Builder(); Document doc = parser.parse (new File("document.xml")); (0) What design pattern is being demonstrated here? (ii) What type of entity is Document Builder? (iii) A simpler approach to creating and using a parser might have been this: Document Builder parser = new Document Builder(); Document doc = parser.parse(new File("document.xml")); What is the problem with this simpler approach? What are the benefits of the approach that the Java API actually uses