In which of the following cases would a manufacturer or seller be held liable for a user's injuries?

a. The user was a sophisticated user.

b. The user was not considered a sophisticated user at the time of the product's manufacture but was considered a sophisticated user at the time of his or her use of the product.

c. The user was injured while engaging in an unusual use of the product that was reasonably foreseeable by the manufacturer.

d. The user was injured while engaging in a misuse of the product that was unforeseeable by the manufacturer.