The frequencies of three separate electromagnetic waves, P, Q and R, are listed as follows: $P = 3 \times 10^{10}\,\text{Hz}$, $Q = 3 \times 10^{13}\,\text{Hz}$, $R = 6 \times 10^{14}\,\text{Hz}$. Which row correctly identifies P, Q and R?
- AP infra-red, Q visible, R ultraviolet
- BP microwave, Q infra-red, R visible
- CP ultraviolet, Q X-ray, R gamma ray
- DP visible, Q ultraviolet, R X-ray