Consider a relation R(A,B,C,D,E) with the following functional dependencies:
ABC -> DE and
D -> AB
The number of superkeys of R is:
a) 2
b) 7
c) 10
d) 12
Answer: c
Explanation: A superkey is a combination of columns that uniquely identifies any row within a relational database management system (RDBMS) table.
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