Question $3(2\mathrm{.}5$ points$)$

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Consider a $3-$phase Y $-$connected source: the ratio of its phase voltages' magnitude to its line voltages' magnitude is

$1$:$1$

$1\mathrm{.}732$ : $1$

$1\mathrm{.}414$ : $1$

$1$:$1\mathrm{.}414$

$1$:$1\mathrm{.}732$