what is the right answer ,in java , full explanation please , thank you

20) Following student chass diagram is given. It is requested to implement locate function which will take an arraylist of Student objects as input and will return the Student object with the highest IdNum. public static Student locate(ArrayList s) emethod body? Which of the tollowing could replace > so that the method works as intended? 1) int max =5.get(0)ggetidNum(); for (int t=1; max ). max = s.get(i) getid Num(); return iset(i); ) i) return s.get {0} : iI) int index =0; int max=5.get(0), getidNum ( ): for (int i=1;i max) \{ max = s.get(i).getidNum(li index =i; 1 1 return s-get(index): (ii) int max=0; for ( int =1;1 s.get(max).getidinum(l)) \{ max=i; 1 return 5-get(max): a) I only b) II only c) Ilionly d) 1 and III e) liand Ill