A cathode-ray oscilloscope (c.r.o.) shows a waveform as illustrated. The time gap between two neighbouring peaks of the waveform is $0.006\,\text{s}$. What is the c.r.o. time-base setting?
- A$2\,\mu\text{s}/\text{division}$
- B$20\,\mu\text{s}/\text{division}$
- C$2\,\text{ms}/\text{division}$
- D$3\,\text{ms}/\text{division}$