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For a database relation $R(a, b, c, d)$ where the domains of a, b, c and d include only atomic values and only the following functional dependencies and those that can be inferred from them hold:

$a \rightarrow c$

$b \rightarrow d$

The relation is in ____

  1. First normal form but not in second normal form
  2. Second normal form but not in third normal form
  3. Third normal form
  4. BCNF
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