Glycogen is a polymer made from glucose. Which description best outlines its structure?
- A$\alpha$-glucose joined by glycosidic bonds involving carbons $1$ and $4$
- B$\alpha$-glucose joined by glycosidic bonds involving carbons $1$, $4$ and $6$
- C$\beta$-glucose joined by glycosidic bonds involving carbons $1$ and $4$
- D$\beta$-glucose joined by glycosidic bonds involving carbons $1$, $4$ and $6$