Question 10: Consider the code given below. Choose the correct option.

1import java.util.*;
2class Television{
3    TreeMap<String, String> f = new TreeMap<String, String>();
4    public Television() {
5        f.put("LG", "Korea");
6        f.put("Toshiba", "Japan");
7    }
8    public String getManufacturer(String t){
9        return f.get(t);
10    }
11}
12public class OptionalTest {
13    public static void main(String[] args){
14        Optional<String> op1 = Optional.ofNullable(new Television()
15                                    .getManufacturer("Toshiba"));
16        Optional<String> op2 = Optional.ofNullable(new Television()
17                                    .getManufacturer("lg"));
18        op1.ifPresent(n->System.out.println(n.toUpperCase()));
19        op2.ifPresent(n->System.out.println(n.toUpperCase()));
20    }
21}