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Which one of the following statements is true?

  1. X.121 suggest the first 3 digits identify a country
  2. X.121 requires that all addresses be 14 digits long
  3. The first 3 digits of an address are the DNIC

The CCITT recommended that addresses in a Public Data Network 5 to 14 digits long.

The first four digits are the DNIC (Data Network Identification Code) followed by 1 to 10 digits more.

The correct answer is "X.121 suggest the first 3 digits identify a country." 311 and 310 are country codes identifying the United States; 208 is the country code for France.