Under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), commonly known as Superfund, which of the following parties would be liable to the Environmental Protection Agency (EPA) for the expense of cleaning up a hazardous waste disposal site?

I. The current owner or operator of the site.

II. The person who transported the wastes to the site.

III. The person who owned or operated the site at the time of the disposal.

a. I and II.

b. I and III.

c. II and III.

d. I, II, and III.