Three of the following entries describe strategic situations that allow an innovator firm to get by with less than a high level of R&D spending. The fourth requires a high level of R&D. a. Laggard R&D strategy and the rapidly advancing stage of the Technology S-curve b. Follow-the-leader R&D strategy and the early stage of the Technology S-curve c. Follow-the-leader R&D strategy and the rapidly advancing stage of the Technology S-curve d. First-to-market R&D strategy and the mature stage of the Technology S-curve