Which IPv6 address notation is valid?

Question:

Which IPv6 address notation is valid?

• 2001:0DB8::ABCD::1234
• ABCD:160D::4GAB:FFAB
• 2001:DB8:0:1111::200
• 2001::ABCD::

Explanation: IPv6 addresses are represented by 32 hexadecimal digits (0-9, A-F). The size of the notation can be reduced by eliminating leading zeroes in any hextet and by replacing a single, contiguous string of hextets containing all zeroes with a double colon, which can only be used one time.

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