When creating an IPv6 unique local unicast address range, what size is the unique global ID that must be specified?

A) 40 bits
B) 64 bits
C) 32 bits
D) 16 bits

A
Explanation: A) The following structure is used when creating a unique local unicast address range:
The first 2 hex digits are FD.
The next 10 hex digits (40 bits) are used for a unique global ID.
The next 4 hex digits (16 bits) are used as a subnet field.
The last 16 hex digits (64 bits) are used as an interface ID field.