Island Breeze Company designs and makes desk, window, and ceiling fans. In a product liability suit based on negligence, Island Breeze could be liable for vio$-$lating its duty of care with respect to all of the following except

a$.$ the design of the fans

b$.$ the production process used to make the fans

c$.$ the warnings on the labels of the fans

d$.$ a consumer's unforeseeable misuse of a fan