You can't create a soft edge with squares; squares have right-angle corners, all you can do is create the illusionof a soft edge.

If a thread tries to lock a mutex that is already locked

A. the thread is suspended B. the pthread_mutex_lock returns an error code

Analyze the following code:

``` public class Test1 { public static void main(String[] args) { xMethod(new double[]{3, 3}); xMethod(new double[5]); xMethod(new double[3]{1, 2, 3}); } public static void xMethod(double[] a) { System.out.println(a.length); } } ``` a. The program has a compile error because xMethod(new double[]{3, 3}) is incorrect. b. The program has a compile error because xMethod(new double[5]) is incorrect. c. The program has a compile error because xMethod(new double[3]{1, 2, 3}) is incorrect. d. The program has a runtime error because a is null.