Consider two relations with three attributes each as R1(A1,A2,A3) and R2(B1, B2,B3)

R1(A3) references R2(B1). R2 is self referential R2(B1) references R2(B3). (On deletion cascade deletion is applied)

A1	A2	A3
k	U	3
L	J	3
L	U	5
K	j	6

B1	B2	B3
3	H	5
5	J	3
6	H	1
7	j	6

If delete operation is performed and all tuples in R1 are deleted that have R2(B1)=3.

This operation performs how many delete operations?