直三棱柱ABC-A₁B₁C₁的各顶点都在同一球面上．若AB=AC=AA₁=2，∠BAC=120°，则此球的表面积等于（    ）。

(b) Kaya had promised his wife, Maya, that he would buy her a diamond bracelet for her birthday, which was on 1 April 2010. However, Kaya did not keep his promise. When Maya reminded Kaya about his promise, he replied that he had changed his mind about buying her the bracelet.Maya is disappointed with Kaya and wishes to sue him for breach of contract.Required:Advise Maya on her chances of success. (5 marks)