Consider three compounds, NaCl, Cl₂, and HCl. Which statement is true?
a. NaCl is a solid at room temperature, Cl₂ and HCl are gases.
b. Cl₂ is a solid at room temperature, NaCl and HCl are gases.
c. HCl is a solid at room temperature, NaCl and Cl₂ are gases.
d. NaCl and HCl are solids at room temperature, Cl₂ is a gas.