The owner of a nursery sued a manufacturer in federal court for damage to his growing trees after one of the manufacturer's factories negligently emitted toxic gas. In interrogatories answered on May 1, the nursery owner truthfully stated that the leaves on his red maple trees are normally out by April 15, but this year the red maples do not have any leaves. A week later, on May 8, all of the nursery owner's red maples have normal leaves on them.
Is he under a duty to supplement the responses he gave in the interrogatory?
a. No, unless the manufacturer asks for an update during the discovery period.
b. No, because the information provided in the interrogatory was true.
c. Yes, because the nursery owner knows the information provided in the interrogatory is no longer true.
d. Yes, unless the manufacturer could find the information on its own.