#anti-symmetry

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On the domain $\{1, 2, 3\}$ , which relation is both symmetric and anti-symmetric?

$\{\langle 1,2\rangle, \langle 2,1\rangle\}$ 1
$\{\langle 1,1\rangle, \langle 2,2\rangle\}$ 2
$\{\langle 1,2\rangle, \langle 2,3\rangle\}$ 3
$\{\langle 1,1\rangle, \langle 1,2\rangle, \langle 2,1\rangle\}$ 4

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