Which Polysaccharide Bond Cannot Be Broken by Mammalian Enzymes That $\alpha$

Multiple Choice

Which polysaccharide bond cannot be broken by mammalian enzymes that normally digest polysaccharides?

A) $\alpha$ (1->4) glycosidic linkages
B) $\beta$ (1->4) glycosidic linkages
C) $\alpha$ (1->6) glycosidic linkages
D) $\beta$ (1->6) glycosidic linkages
E) phosphate ester linkages