...optional in this version. The following functions are present: bcmp () bcopy () bzero () ecvt () fcvt () ftime () gcvt () getwd () index () mktemp () rindex () utimes () wcswcs …...fetch() dbm_firstkey() dbm_nextkey() dbm_open() dbm_store() dirname() dlerror() drand48() ecvt() [POSIX.1-2001 only (function removed in POSIX.1-2008)] encrypt() endgrent() endp…