6 24. (9 points) The following code segment is taken from a C program. Please choose from the answers below to fill in the blanks: A. tid B. summation C. argv D. attr E. NULL pthread_attr_init(&attr); pthread_create (&tid, sattr, summation, argvll])i pthread_join(tid, NULL) The variable represents the thread id. The variable epts thefinction that will run te trad code. The variable_ represents the command line arguments