The list of eligible rules to be fired in task will be prepared in advance and the same will e called as

In rule engine terminology, the list of eligible rules ready to be fired is called the 'agenda'. The agenda contains rules whose conditions have been evaluated to true and are waiting in queue to execute. 'Rule group' and 'eligible rules' are descriptive terms but not the formal name. 'Agenda filter' is something that affects the agenda, not the agenda itself.