Pressing the Ctrl-C combination on the keyboard while a command is executing in the foreground sends which of following signal codes?

SIGHUP (signal 1) is sent to a process when its controlling terminal is closed or the session leader disconnects, not from Ctrl-C.

SIGINT (signal 2) is the interrupt signal generated by the terminal driver when the user presses Ctrl-C on the keyboard. The kernel delivers this signal to the foreground process group, giving the process an opportunity to catch it, clean up resources, and exit gracefully. This is distinct from a forced kill because a process can install a signal handler to intercept SIGINT.

SIGQUIT (signal 3) is sent by Ctrl-\ and causes the process to terminate and produce a core dump, unlike the Ctrl-C interrupt.

SIGKILL (signal 9) forcefully terminates a process without giving it a chance to catch or handle the signal and is not generated by any keyboard combination.

SIGTERM (signal 15) is the default termination signal sent by the kill command with no explicit signal number and is not triggered by Ctrl-C.