java fundamental question related to string

public class Myclass { Public static void main(String args[]) { String s=�??hello�??; StringBuffer sb=new StringBuffer(s); Sb.reverse(); If(s==sb) system.out.println(�??a�??); If(s.equals(sb)) system.out.println(�??b�??); If(sb.equals(s)) system.out.println(�??c�??); } } Output?

a) the pgm will throw ClassCastException b) compilation fails since s==sb illegal c) compilation fails since s.equals(sb) illegal d) print c

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