What is the name of the E.164 domain defined by the ITU and IETF for ENUM queries?

The correct choice refers to E.164 as it relates to ENUM queries. The E.164 numbering plan is a global standard for international telephone numbers, and ENUM is a protocol that translates telephone numbers into Internet identifiers.

The domain "E164.arpa" is specifically designated by the ITU and IETF for use with ENUM queries. This domain operates under the ARPA top-level domain and is utilized to map E.164 numbers into the DNS, allowing for the retrieval of resource records associated with a phone number.

This mapping is essential for various applications, such as VoIP services, where it is necessary to translate a phone number into an IP-based address. The other options do not serve this specific function within the context of ENUM and E.164; therefore, they do not accurately represent the designated domain established for ENUM queries.