With reference to his reply to question 679 on 23 April 2018, (a) what is the current status of the legal case in the matter between .ZA Domain Name Authority and the ZA Central Registry, (b) what attempts at mediation of the issue have been held since the Deputy Minister withdrew her participation after 7 June 2017, (c)(i) who conducted the specified mediation between the parties, (ii) on what date and (iii) what was the outcome of the mediation attempts and (d)(i) what did the attempts cost the .ZA Domain Name Authority and (ii) who is paying the costs?