Which two host portion format conditions are true for directory URI on Cisco Unified Communications Manager?

Which two host portion format conditions are true for directory URI on Cisco Unified
Communications Manager? (Choose two.)

A.
It is case sensitive.

B.
It cannot start with a hyphen.

C.
It must have at least one character.

D.
It supports IPv4 or IPv6 addresses, or fully qualified domain names.

E.
It cannot end with a hyphen.

F.
It supports the & character.