Equivalentie relation

$x$ $x$ $x$ $x$ $x$ $x$ $x$ $x$ $x$

Which of the below relations on $X=\{1,2,3,4\}$ are or are not equivalence relations?

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$\bigl\{(1,1),(2,2), (3,3), (4,4)\big\}$

$\bigl\{(1,1),(2,2),(3,3), (1,2),(1,2) ,(1,3),(3,1\big\}$

$\bigl\{(1,1),(2,2), (1,2), (2,1), (3,3), (4,4)\big\}$

$\bigl\{(1,1),(2,2),(3,3),(1,2),(2,1),(1,3),(3,1)\big\}$

$\bigl\{(1,2),(1,3), (1,4), (2,3),(2,4),(3,4)\big\}$

$\bigl\{(1,1),(2,2), (1,2), (2,1), (3,3), (4,4), (3,4), (4,3)\bigr\}$

no equivalence relation

equivalence relation

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