Which two of these statements are true of IPv6 address representation? (Choose two.)

A.
There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

B.
A single interface may be assigned multiple IPv6 addresses of any type.

C.
Every IPv6 interface contains at least one loopback address.

D.
The first 64 bits represent the dynamically created interface ID.

E.
Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

Explanation:
http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd80
26003d.pdf
A single interface may be assigned multiple addresses of any type (unicast, anycast, multicast).
Every IPv6-enabled interface must contain at least one loopback and one link-local address.
Optionally, every interface can have multiple unique local and global addresses.
IPv6 host addresses can be assigned in multiple ways:
Static configuration
Stateless autoconfiguration
DHCPv6
When IPv6 is used over Ethernet networks, the Ethernet MAC address can be used to generate
the 64-bit interface ID for the host. This is called the EUI-64 address.
Since MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits required.