The symbol → indicates functional dependency in the context of a relational database. Which of the following option is/are TRUE?
(x → y and y → z) implies x → z
((x, y) → z and w → y) implies (x, w) → z
(x, y) → (z, w) implies (x, y) → z
(x, y) → (z, w) implies x → (z, w)
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