Study each of the following case. Answer the questions that follow with Yes or No.

Kriz, an elderly man who was quite overweight, purchased a power lawnmower from a nationally known retailer. To start the lawnmower, the user needed to bend down to draw the starter cord. When Kriz bent over, he suffered a heart attack. Kriz sued the retailer, arguing that the lawnmower should have contained a warning advising older, overweight users not to bend over.
a. Is this lawsuit an example of a product liability based upon product flaw?
b. Is this lawsuit an example of a product liability based upon design defect?
c. Will Kriz be required to prove that the lawnmower was the proximate cause of his ailment?