What happens when the code that follows is executed?

LinkedList units $=$ new LinkedList$<>()$;

units.add$(8)$;

units.add$(12)$;

units.add$(3)$;

System.out.println$($units$.$get$(1))$;

Group of answer choices

$8$ is printed to the console.

$12$ is printed to the console.

A runtime error occurs because the add$()$ method can$$t wrap the int value in the Integer class.

A compile$-$time error occurs due to a syntax error.