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Which IPv6 address is valid?
2001:0db8:0000:130F:0000:0000:08GC:140B
2001:0db8:0:130H::87C:140B
2031::130F::9C0:876A:130B
2031:0:130F::9C0:876A:130B
The correct answer is: 2031:0:130F::9C0:876A:130B
The valid IPv6 address among the choices provided is constructed according to the guidelines for IPv6 formatting. An IPv6 address is made up of eight groups of four hexadecimal digits, separated by colons. Each hexadecimal digit can be one of the digits 0-9 or letters A-F. In the correct answer, the address 2031:0:130F::9C0:876A:130B accurately conforms to the standard as it uses valid hexadecimal characters and proper structure. It is also utilizing the double colon (::) notation, which is allowed in IPv6 to represent one or more groups of zeros. This notation is particularly useful when there are contiguous sections of zero groups, effectively simplifying the address representation. The absence of invalid characters, such as letters beyond F or multiple occurrences of the double colon, helps solidify its validity. Thus, this address adheres strictly to IPv6 formatting rules, making it a correct choice.