IPv6 주소 ′a184:0a01:0000:0000:cd8c:1000:317b:00ff′ 를 생략하여 표기한 것으로 알맞은 것은?
1
a184:a1::cd8c:1:317b:ff
2
a184:a01::cd8c:1000:317b:ff
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a184:a01:0:0:cd8c:10:317b:0ff
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a184:a01:cd8c:1000:317b:ff