C-05-Q060mediumsingle_mcqFormula of aluminum sulfate is —aAl3(SO4)2Al_3(SO_4)_2Al3(SO4)2bAl2(SO4)3Al_2(SO_4)_3Al2(SO4)3cAl(SO4)3Al(SO_4)_3Al(SO4)3dAlSO4AlSO_4AlSO4