Which three statements about LDAP are true? (Choose three.)

A.
LDAP uses UDP port 389 by default.

B.
LDAP is defined in terms of ASN.1 and transmitted using BER.

C.
LDAP is used for accessing X.500 directory services.

D.
An LDAP directory entry is uniquely identified by its DN.

E.
A secure connection via TLS is established via the UseTLS operation.