Consider the following E/R diagram, suppose relation R is a 1: M relationship from entity set B to entity set A. The attributes of A are A1, A2, A3 where A1 is a primary key and the attributes of B is B1, B2, and B3 where B1 is a primary key. A2 and B3 are multivalued attributes in entity A and B respectively. Relation R doesn’t have any attributes. What is the minimum number of tables needed for the corresponding E/R diagram so that each table is in 3NF?