Schema R1 has {A,B} as primary key and {A} as foreign key to R2[A] Schema R2 has {A} as primary key Check all the correct statements below about the following tables insert into R1 values (4,bb ', ' e,1) violates a primary key constraint insert into R2 values (4, ' ') violates a foreign key constraint delete from R2 where A=2 violates a foreign key constraint (assuming NO cascading deletions) delete from R1 where A=2 violates a foreign key constraint (assuming NO cascading deletions) insert into R2 values (2,W ') violates a primary key constraint insert into R1 values \( \left(4, '{ }^{\prime} ', '{ }^{\prime} ', 1 ight) \) violates a foreign key constraint