Question: What is implied by the 'unrestricted digital information' transfer capability in a Public Land Mobile Network (PLMN), according to 3GPP principles?
Option 1: Only speech and audible signalling tones are transferred without alteration.
Option 2: Transfer of Group 3 Fax information with bit sequence dependence.
Option 3: Digital representation of speech information coded according to PSTN rules only.
Option 4: Bit sequence independence, digit sequence integrity, and bit integrity during information transfer.
Explanation: The correct answer is Option 4 because 'unrestricted digital information' transfer capability specifically implies that the information (sequence of bits) is transferred at its specified bit rate without any alteration. This guarantee encompasses three key aspects: Bit Sequence Independence, Digit Sequence Integrity, and Bit Integrity.