Refer to the exhibit. A network administrator plans to announce the site subnets to the WAN using route summarization instead of announcing every subnet. What is the smallest summary route that…

2001:DB8:ABCD:0003::/60 is not the smallest summary because a /60 starting at '3' would exclude addresses that are logically part of the larger 2001:DB8:ABCD::/60 block (e.g., 2001:DB8:ABCD:0000::/64, 2001:DB8:ABCD:0001::/64, 2001:DB8:ABCD:0002::/64).

The subnets are 2001:DB8:ABCD:0003::/64, 2001:DB8:ABCD:0004::/64, 2001:DB8:ABCD:0005::/64, 2001:DB8:ABCD:0006::/64, and 2001:DB8:ABCD:0007::/64. Converting the varying fourth hextets (0003-0007) to binary reveals their common prefix extends to 12 bits within that hextet. The first 48 bits (2001:DB8:ABCD:) plus these 12 common bits results in a /60 prefix, specifically 2001:DB8:ABCD:0000::/60, which can be shortened to 2001:DB8:ABCD::/60.

2001:DB8:ABCD::/64 is a specific /64 subnet (covering 2001:DB8:ABCD:0000:: through 2001:DB8:ABCD:0000:FFFF:FFFF:FFFF:FFFF) and does not encompass all the given subnets (0003 through 0007).

2001:DB8::/32 is a very broad summary that covers an unnecessarily large range of addresses and is not the 'smallest summary route' for the given specific subnets.