What remains on guard whenever your computer is on, protecting against unauthorized traffic both incoming and outgoing?

What will be displayed after the following statements are executed?

``` int y = 10; if (y == 10) { int x = 30; x += y; System.out.println(x); } ``` a. 40 b. 30 c. 20 d. The code contains an error and will not compile.

Under MS-DOS, the boot routine is stored on the __________ sector of each disk.

a. first b. second c. third d. fourth