Who can appoint the arbitrator pursuant to an Arbitration Agreement of reference of disputes to a sole arbitrator?

Who can appoint the arbitrator pursuant to an Arbitration Agreement of reference of disputes to a sole arbitrator? Correct Answer Both (A) and (B)

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In a suit for specific performance of an Agreement of Sale of immovable property the defendant along with his written statement files an application under Section 8 of the Arbitration & Conciliation Act for referring the parties to arbitration in accordance with arbitration clause contained in the Agreement to Sell. The plaintiff admits the existence of the arbitration clause as well as that the subject matter of suit is subject matter of such arbitration clause. The Court shall:
A institutes a suit against B with respect to disputes arising out of an agreement entered into with B. The said agreement provides for arbitration of all disputes including the disputes subject matter of suit. The court before which the suit comes up for admission
An Arbitration Agreement dated 1st December, 2018 provides for reference of disputes to four arbitrators with two to be appointed by each of the parties. The Arbitration Agreement:
If within thirty days the parties fail to appoint their arbitrators, or the arbitrators fail to appoint the third arbitrator, the arbitrator shall be appointed by the
In arbitration with 'Sole arbitrator', if the parties fail to agree on the arbitrator within thirty days from receipt of request by one party form the other party to so agree then: