...- _XOPEN_CRYPT - _SC_XOPEN_CRYPT The following functions are present: crypt () encrypt () setkey () XSI - _XOPEN_REALTIME - _SC_XOPEN_REALTIME This option implies the following …..._unlocked() putchar_unlocked() putenv() pututxline() rand() readdir() setenv() setgrent() setkey() setpwent() setutxent() strerror() strsignal() [Added in POSIX.1-2008] strtok()…