Which two of these array declarations are valid?

1.String[5] array;

2.String array[];

3.String[] array;

4.String array[5];

OPTIONS:

2 & 3

1 & 4

1 & 3

2 & 4

2.Which of the following interfaces allows you to remove any duplicated item that is inserted into it and warrants to order its elements based on their values?

java.util.Map

java.util.Stack

java.util.List

java.util.Set