Answer :
Out of the given options the valid IPv6 addresses1 F. :192:168:1:1.
All of the options except for F. are valid IPv6 addresses. Option A, B, and C are all valid forms of representing the same address. Option D represents the loopback address, which is a valid address. Option E is also a valid representation of the loopback address. Option F is not a valid IPv6 address as it has too few groups of digits. IPv6 addresses should have 8 groups of digits separated by colons.
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