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2 pts Question 29 Which two of the following statements are differences between semi-structured data model (such as JSON or XML) and the relational data model? Select all that apply. The relational data model is based on relations (sets) of homogeneous tuples, while XML or JSON can represent data with tree-like, nested structures. O In the relational data model, every attribute must have a name and type, while in XML or JSON, data values can be given without any meta-data or even name. O The relational data model is semi-structured (it supports NULL values), while XML or JSON have a rigidly structured data model. O The relational data model needs to specify a schema first, while semi-structured data is self-describing and hence can be parsed without a priori knowing the data's structure. O Unstructured text data must be first transformed into semi-structured data before it can be analysed; the relational data model does not help in this case.