Which of the following phase transitions is/are endothermic? 1. liquid water freezing to a solid at its normal freezing point of 0.0 °c.2. the sublimation of solid carbon dioxide into the gas phase.3. gaseous sulfur dioxide condensing into a liquid at its boiling point of –10.0 °c. a) 1 only b) 2 only c) 3 only d) 1 and 2 e) 1, 2, and 3