Criminal suspects and their defenders may apply for the exclusion of illegal evidence and provide relevant clues or materials during investigation, examination and arrest, and examination and prosecution, and the procuratorate shall investigate and verify them. The conclusion of investigation shall be informed in writing to the criminal suspect and his defender. So option a and option b are correctly stated. If evidence is really collected by illegal means, the procuratorial organ shall put forward rectification opinions to the investigation organ. The investigation organ shall exclude the illegal evidence found in the examination and shall not be used as the basis for requesting approval of arrest or transfer for examination and prosecution. Therefore, option C is correctly stated. The procuratorate shall exclude the illegal evidence found in the examination and shall not be used as the basis for approving or deciding to arrest or prosecute. The excluded illegal evidence shall be transferred with the case and marked as illegal evidence to be excluded according to law. Therefore, the D option is expressed correctly.
To sum up, the correct answer to this question is ABCD.