Consider the relation R(X, Y, Z, W, V) in which X, Y, Z, W, and V are the attributes and the following set of functional dependencies
A = { {X, Y} → {Z, W}, {X, W, V} → {Y, Z} }
Which of the following is the trivial functional dependency in A+, where A+ is closure of A?
1
{X, Z} → {Z, W}
2
{X, V} → {W}
3
{X, W, V} → {Y, W}
4
{Y, W} → {Y, X}
5
{X, V} → {V}