True or False

1. Its hard to make processes share data because they operate in difference address spaces; it is trivial to make threads in a process to share data because they operate in the same address space, which explains why the Word Processor example application we studied advocates the use of threads.
2. When one thread opens a file, the file is visible to the other threads in the same process and they can read/write it.
3. Like UNIX processes, UNIX threads are always hierarchical.
4. Processes have no counterpart of pthread_yield.