After the following program is finished, how many bytes are written to the file t.dat?
```
import java.io.*;
public class Test {
public static void main(String[] args) throws IOException {
DataOutputStream output = new DataOutputStream(
new FileOutputStream("t.dat"));
output.writeChars("ABCD");
output.close();
}
}
```
a. 2 bytes.
b. 4 bytes.
c. 8 bytes.
d. 12 bytes.
e. 16 bytes.
c. 8 bytes.
Two bytes of Unicode for each character is written to output.
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