What notation demonstrates leading zero compression for IPv6?

The correct answer that demonstrates leading zero compression for IPv6 addresses is found in choice B, which is 10AB::3:0:1234:5678. In IPv6, leading zeros can be omitted from each 16-bit block. For example, instead of writing the block 0010AB, it can simply be written as 10AB. Furthermore, the double colon (::) signifies that one or more blocks of zeros have been compressed. This notation makes it much easier to represent IPv6 addresses, especially since they can be long and contain many zeros.

In contrast, the first choice shows an IPv6 address that retains all leading zeros and does not utilize compression, making it not compliant with the leading zero compression method. The other two choices provided are actually IPv4 addresses, which do not involve leading zero compression in the same manner as IPv6 addresses. Understanding the prefix and zero compression notations is essential for differentiating between IPv4 and IPv6, as well as for correctly formatting IPv6 addresses for use in various networking contexts.