Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.)

Given:

1. public class TestString3 {
2. public static void main(String[] args) {
3. // insert code here
4.
5. System.out.println(s);
6. }
7. }

Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.)

A.
String s = “123456789”;
s = (s-“123″).replace(1,3,”24”) – “89”;

B.
StringBuffer s = new StringBuffer(“123456789”);
s.delete(0,3).replace(1,3,”24″).delete(4,6);

C.
StringBuffer s = new StringBuffer(“123456789”);
s.substring(3,6).delete(1,3).insert(1, “24”);

D.
StringBuilder s = new StringBuilder(“123456789”);
s.substring(3,6).delete(1,2).insert(1, “24”);

E.
StringBuilder s = new StringBuilder(“123456789”);
s.delete(0,3).delete(1,3).delete(2,5).insert(1, “24”);

Explanation:
A:
Main.java:4: operator – cannot be applied to java.lang.String,java.lang.String
s = (s-“123″).replace(1,3,”24”) – “89”;
^
1 error

B: 4247

C:
Main.java:4: cannot find symbol
symbol : method delete(int,int)
location: class java.lang.String
s.substring(3,6).delete(1,3).insert(1, “24”);
^
1 error

D:
Main.java:4: cannot find symbol
symbol : method delete(int,int)
location: class java.lang.String
s.substring(3,6).delete(1,2).insert(1, “24”);
^
1 error

E: 4247