Prisoners have been trying to escape from a jail. Most of the attempts involve climbing over perimeter walls or digging from under their cells. To discourage more attempts, the warden can either post guards on the walls or conduct regular inspections of cells but not both. (a) Express this game in normal form. (b) Express this game in extensive form, assuming that a prisoner and the warden make their decisions at the same time. (c) Express this game in extensive form, assuming that the warden makes his/her decision first, and the prisoner knows the warden's decision when he/she chooses the strategy