Following are statements regarding the process for one mole of a monatomic ideal gas.
(1) In an isothermal process, the gas temperature is always constant.
(2) In the adiabatic process, the energy in the gas is always constant.
(3) The energy in an ideal gas depends only on the temperature the gas.
(4) The only way to increase the energy in a gas is to add heat to the gas.
Of the four statements above, the correct statement is
a. (1), (2) and (3)
b. (1) and (3)
c. (2) and (4)
d. (4)
e. (1), (2), (3) and (4)