Exercise 4.10) Consider the following code segment: \begin{tabular}{|l|} \hline pid_t pid; \\ pid = fork(); \\ if (pid ==0){/ child process / \\ fork(); \\ thread_create(...); \\ \}ork(); \\ fork \\ \hline \end{tabular} After running this program, answer the following questions. a. How many processes do we have? b. How many threads do we have (including main threads)