Which of the following illustrates a heuristic?
a. Calculating the area of a rectangle by multiplying the length times the width
b. Using news reports of corporate fraud to estimate how much business fraud occurs in American business
c. Looking in each room of your home to find your sleeping cat
d. Following a new recipe to bake a cake for your friend
e. Trying cvery key on your mom's key ring until you find the one that unlocks the seldom-used storeroom in the basement