In $2010,$ after pleading guilty to a single criminal charge of selling liquid Tylenol contaminated with metal particles, Tylenol agreed to pay $$25$ million to resolve the case and issued a voluntary recall after a consumer found "black specks," later identified as chromium and nickel particles, in the bottom of a liquid Tylenol bottle.

This is an example of $$

a$.$ Manufacturing defect

b$.$ Design defect

c$.$ Negligence

d$.$ Contributory negligence

e$.$ None of the above