Let R(a, b,c)and S(d,e, f) be two relations in which d is the foreign key of S that refers to the primary key of R Consider the following four operations in R and S
I.Insert into R
II.Insert into S
III.Deletion from R
IV.Deletion from S
Which of the following can cause violation of the relational integrity constraint above?

A

Both I and IV

B

Both II and III

C

All of these

D

None of these