For the following code segment, how many unique processes and threads are created? Justify. pid t pid; pid if (pid = 0) {/* child process */ fork (); thread create (. fork (); i. } fork (); Considering the following snapshot of a system and using the banker's algorithm: Max Available ABCD 0012 1750 2355 0454 Allocation ABCD 0010 1000 2334 0232 ABCD 1222 Po P P P3 What is the content of the matrix Need? Is the system in a safe state? Justify. If a request from P3 arrives for (0,1,2,1), can the request be granted immediately? Justify.