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ATP synthase is
a) both an enzyme that makes ATP and a channel protein, and helps hydrogen ions cross the thylakoid membrane.
b) both an enzyme that makes ATP and a channel protein, and helps hydrogen ions cross the chloroplast inner membrane
c) both an enzyme that makes ATP and a carrier protein, and helps hydrogen ions cross the thylakoid membrane
d) both an enzyme that make ATP and a carrier protein, and helps hydrogen ions cross the chloroplasts inner membrane.