After the following program is finished, how many bytes are written to the file t.dat?

Question

```
import java.io.*;

public class Test {
public static void main(String[] args) throws IOException {
DataOutputStream output = new DataOutputStream(
new FileOutputStream("t.dat"));
output.writeUTFString("ABCD");
output.close();
}
}
```
a. 2 bytes.
b. 4 bytes.
c. 6 bytes.
d. 8 bytes.
e. 10 bytes.

Answer 1

c. 6 bytes.
"ABCD" are ASCII code, so each takes one byte in UTF. Total is 6 because the first two bytes stores the number of characters in the string.