In the following code, what are the access permissions at the user, group, and other levels for the file test.txt assuming the open() system call succeeds? Write them in octet format. For example, if the user, group, and other each had RWX permissions, you'd write 0777. If you are not clear on the symbolic notations for permission modes, you may refer to the MAN pages for open here: open() int main() { int fd = open ("test.txt", ww O_WRONLY | O_CREAT | O_TRUNC, S_IRWXUS_IRGRP |S_IWOTH); if (fd