Which the following statements is/are true:

1. A.

   if A→B, B→C are given FDs then A→C is called trivial functional dependency

2. B.

   lossless join and dependency preserving decomposition into BCNF is always possible

3. C.

   natural join is not a basic operator in relational algebra

4. D.

   if a relation is BCNF and there doesn’t exist any non-trivial multivalued dependency, then it is in 4NF

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