Answer:
B. Gemma is using a heuristic and Frank is using an algorithm
Step-by-step explanation:
Heuristic approach are methods of solving problems in which the shortest possible means to solve the issue is embraced which explains Gemma searching for the lens near the base of the fridge and around the stove because these are the two appliances she remembers using when she was last in the kitchen.
Algorithm approach involves following thorough steps on solving a problem which Frank did by examining each linoleum tile in turn to see if the lens is contained within the square.