Which of the Following Is Correct with Respect to R&D

Which of the following is correct with respect to R&D?

A) R&D focuses on physical products,not services.
B) Pure,or basic,R&D involves focusing specifically on how a technological innovation can be put to use to make products that can be sold in the marketplace.
C) Applied R&D involves improving knowledge in an area without regard to how it might be useful in the marketplace.
D) R&D intensity refers to R&D spending as a percentage of a company's sales revenues.
E) All of these statements are correct.