What is a fundamental difference between named and unnamed pipes? Select one: a. Unnamed pipes are used between threads while named pipes are used between processes or threads. b. The kernel keeps track of named pipes by pipe descriptors and unnamed pipes by pipe pointers. c. Named pipes have both kernel space buffering and user space buffering while unnamed pipes have only kernel space buffering. d. Unnamed pipes can be set up only between related processes while named pipes can be set up between related or unrelated processes. What happens when you press Ctrl-C on a Linux machine? Select one: O a. The SIGINT signal is raised. O b. A socket is closed c. Output of a process is redirected to stderr. d. A pipe is set up between the terminal and a process.