5/6 Follow-up: Question 2 Select all the true statements about signals. The sigaction system call is used to change the code that is executed when a signal arrives at a process. A signal handling function that you write must always have the same signature. If a SIGINT signal arrives before the call to sigaction, it will still execute the handler function that we wrote. The signal handling function that we install will cause the process to terminate, even if it doesn't call exit. The default action of a SIGKILL signal can never be modified. "Installing a signal handler" means writing a function with the appropriate signature and calling sigaction with the function pointer as an argument (a field of struct sigaction *)