In a given process, heat is added to a pure substance at constant pressure (with no other energy transfers to or from the substance). Which of the following can be said about the temperature of the pure substance during this process. (select all answers that are possible; more than one may be correct) Select one or more:
a. The temperature of the substance can increase.
b. The temperature of the substance can stay the same.
c. The temperature of the substance can decrease.