For the '.career Arabic' Internationalized Domain Name (IDN) table, find out its current version and the organization responsible for its maintenance. Additionally, for the 'e164.arpa' second-level domain, explain its primary purpose and identify the specific RFC document that defines its operational usage.
Navigate to the 'Repository of IDN Practices' page on iana.org. Locate the entry for '.career Arabic' in the displayed table. Extract the 'Version' and 'Responsible Party' for '.career Arabic'. Navigate to the '.ARPA Zone Management' page on iana.org. Locate the 'e164.arpa' entry in the table of second-level domains. Extract the 'Usage / Reference' information, specifically the RFC number, for 'e164.arpa'. Synthesize the collected information into a concise answer.
State the version of the .career Arabic IDN table as 2.5. State the responsible party for the .career Arabic IDN table as Verisign Inc. Explain that 'e164.arpa' is used for mapping E.164 numbers to Internet URIs. State the RFC that defines 'e164.arpa' usage as RFC 6116.