Which of the following statements is NOT true?

a. A manufacturer's duty towards consumers continues after it places a product on the market.

b. A retailer may be liable to the consumer for a defective product.

c. After a manufacturer places a product on the market, its duty towards consumers ends.

d. A manufacturer's duty to warn its customers may be discharged if the warning is issued to a learned intermediary.

e. A manufacturer who places a defective product on the market may be liable for negligence.