19. Given three Boolean variables a, b, c as : a = False, b = True, c = False. Evaluate the following Boolean expressions :

a) b and c : False

b) b or c : True

c) not a and b : True

d) (a and b) or not c : True

e) not b and not (a or c) : False

f) not ( ( not b or not a ) and c) or a : True