Which of the Following Statements Are True of Elements? (Read

Which of the following statements are true of elements? (Read carefully and select all of the correct statements.)

A) C,H,and O stand for carbon,hydrogen,and oxygen.
B) Cu and Cl stand for copper and chlorine.
C) Fe and I stand for iron and iodine.
D) N and Na stand for nitrogen and potassium.
E) Ca and K stand for calcium and sodium.
F) Z and M stand for zinc and magnesium.