Three resistors, each of resistance $R$, are connected in a network, as shown.
The total resistance between points $X$ and $Y$ is $8.0\Omega$.
What is the value of $R$?

1 )
$2.7 Ω$
2 )
$4.0 Ω$
3 )
$5.3 Ω$
$12 Ω$
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