Carbohydrates and lipids — practice question

What linkages are present between the glucose units in cellulose?

• A$\alpha 1\text{-}4$ only
• B$\alpha 1\text{-}4$ and $\alpha 1\text{-}6$
• C$\beta 1\text{-}4$ and $\alpha 1\text{-}6$
• D$\beta 1\text{-}4$ only