(a) Only the following witnesses may be present at the execution:
(i) The director of the department of corrections and any persons deemed necessary to assist him in conducting the execution;
(ii) Two (2) physicians, including the prison physician;
(iii) The spiritual advisers of the prisoner;
(iv) The penitentiary chaplain;
(v) The sheriff of the county in which the prisoner was convicted; and (vi) Not more than ten (10) relatives or friends requested by the prisoner.