4. Without prejudice to other articles in this Part, where it is necessary for the successful execution of a request which can be executed without any compulsory measures, including specifically the interview of or taking evidence from a person on a voluntary basis, including doing so without the presence of the authorities of the requested State Party if it is essential for the request to be executed, and the examination without modification of a public site or other public place, the Prosecutor may execute such request directly on the territory of a State as follows:
(a) When the State Party requested is a State on the territory of which the crime is alleged to have been committed, and there has been a determination of admissibility pursuant to article 18 or 19, the Prosecutor may directly execute such request following all possible consultations with the requested State Party;
(b) In other cases, the Prosecutor may execute such request following consultations with the requested State Party and subject to any reasonable conditions or concerns raised by that State Party. Where the requested State Party identifies problems with the execution of a request pursuant to this subparagraph it shall, without delay, consult with the Court to resolve the matter.