What (a) investigations have been conducted at the National Arts Council of South Africa, (b)(i) are the names of the persons and (ii) is the name of the company and/or institution who were appointed to do the investigation (c) are the names of the persons who appointed the investigators, (d) was the date on which the investigative service were advertised, (e) was the (i) cost and (ii) outcome of the investigation and (f) steps have been taken by his department in this regard?