As per S. 89 of CPC the court may refer disputes for settlement outside court by which of the following modes?

As per CPC S.89  Settlement of disputes outisde the Court.—(1) Where it appears to the Court that there exist elements of a settlement which may be acceptable to the parties, the Court shall formulate the terms of settlement and give them to the parties for their observations and after receiving the observations of the parties, the Court may reformulate the terms of a possible settlement and refer the same for :— (a) arbitration; (b) conciliation; (c) judicial settlement including settlement through Lok Adalat: or (d) mediation.