What task priority will be for a NULL parameter?

Hi,

After several round of test, it is found the default priority matters a lot in task creating. The example code uses:

taskHandle = Task_create(task1Fxn, NULL, NULL);

I would like to know what priority is in this task creating. Thanks,

TI RTOS 2.14.0.10,

CCS 6.1

Int main()
{
    Task_Handle taskHandle;

	/* Call board init functions */
    Board_initGeneral();

    taskHandle = Task_create(task1Fxn, NULL, NULL);
    if (taskHandle == NULL) {
    	System_abort("Task1 create failed");
    }

    taskHandle = Task_create(main3, NULL, NULL);		//	Task_create(main0, NULL, NULL);
    if (taskHandle == NULL) {
    	System_abort("Task3 create failed");
    }