A student recorded the following claims about polysaccharides. 1. Amylose is produced by condensation reactions involving $\beta$-glucose monomers. 2. Branches in amylopectin molecules are formed between carbon atoms $1$ and $4$ on $\alpha$-glucose molecules. 3. In unbranched $\beta$-glucose chains, each monomer is rotated $180^{\circ}$ relative to the monomer next to it. Which statements are correct?
- A1 and 2
- B1 only
- C2 and 3
- D3 only