For a thermocouple the neutral temperature is `270^(@)C` when its cold junction is at `20^(@)C` . What will be the neutral temperature and the temperature of inversion when the temperature of cold junction is increased to `40^(@)C`
A. `290^(@)C, 580^(@)C`
B. `270^(@)C, 580^(@)C`
C. `270^(@)C, 500^(@)C`
D. `290^(@)C, 540^(@)C`