Which one of the following gives the triple point of water?

The triple point of water is the unique temperature and pressure at which water can coexist in solid, liquid, and gaseous phases in thermodynamic equilibrium. It occurs at a temperature of 273.16 K (0.01 °C) and a pressure of about 611.657 Pa, commonly expressed in SI as approximately 6.11 × 10² Pa (or roughly 6.11 mbar). Among the given options, only the choice with 273.16 K corresponds to the triple-point temperature, paired with the low pressure value, making option (b) the intended answer.