rue or false[10 points] (a) with posix, when you fork inside a thread, all the threads of the parent process are copied. (b) threads get the illusion that they have their own address space from the os. (c) the scope of mutex is within a process address space (d) mutex is a locking mechanism, a semaphore is a signaling mechanism (e) we can design a mutex in a way to allow multiple process threads to access a single shared resource (f) we can design a semaphore in a way to allow multiple process threads to access a single shared resource