Given a relation scheme R (x, y, z, w) with functional dependencies set F = {x → y, z → w}. All attributes take single and atomic values only.
A. Relation R is in First Normal Form.
B. Relation R is in Second Normal Form.
C. Primary key of R is xz.
Choose the correct answer from the options given below.

Correct option is C

Thus, A and C only is correct.

Additional Knowledge:
· Statement B: The relation being in 2NF depends on no partial dependency and being in 1NF, which is true here.
· Statement C: xz is correctly identified as the primary key since it uniquely determines all attributes in R(x, y, z, w).