The answer is: D
Explanation
The correct option is D: (a)(b)(c).
Ad hoc arbitration is a type of arbitration that is not administered by an arbitration institution, but by the parties themselves. They have the freedom and flexibility to decide on all aspects of the arbitration, such as the number and selection of arbitrators, the rules and procedures to follow, the applicable law, the language, the place, and the scope and issues to be resolved by arbitration. However, this also means that they have less support and guidance from an institution, and may face difficulties in enforcing the arbitral award. Ad hoc arbitration is often used when the parties want to save costs, time, and maintain confidentiality. Some examples of ad hoc arbitration are the UNCITRAL Arbitration Rules, the CPR Rules, and the Swiss Rules.