You have been asked to help build an artificial intelligence system that can solve well$-$ defined problems. For the type of problems this system is being designed to solve the most important consideration is that you need to ensure that a solution will always be found. Given that, you say that the system should be designed to use

However,

you also point out that if this is the chosen approach, then

P Flag question

$$ A$.$ means$-$ends search; you will need a difference$-$operator table

$$ B$.$ algorithmic search; it could take a long time to find a solution

C$.$ working backwards; there should be fewer pathways right before the goal state than right after the initial state

D$.$ simple search; you cannot solve problems that require moving away from the goal