A single heavy chain of an immunoglobulin molecule has , whereas a single light chain of an immunoglobulin molecule has . Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices six constant domains and two variable domains; two constant domains and two variable domains two constant domains and one variable domain; one constant domain and two variable domains three constant domains and one variable domain; one constant domain and one variable domain one constant domain and one variable domain; three constant domains and one variable domain