Append requested options algorithm (Kea 1.8.0)get configured option listget parameter request list (PRL) from queryget configured options in dhcp4 spacepush back option code to PRLfor each persistent optionfor each item from configured option listget configured options in dhcp4 spaceadd option to responsefirstfoundnot found or already foundfor each item from configured option listyesoption is not set in responsenofor each code in PRL