(6)If the member of the service desires to be heard in person, he shall be so heard. If he desires that oral inquiry be held or if the State Government or the Appointing Authority so directs an inquiry shall be held by the Enquiry Officer. At such inquiry evidence shall be heard as to such of the allegations as are not admitted and the member of the service charged shall be entitled to cross-examine the witness who gives evidence in person and to have such witness called as he may wish :Provided that the Enquiry Officer may, for reasons to be recorded in writing, if refused to call a witness whose evidence is, in the opinion of the Enquiry Officer not relevant or material.