The diagram illustrates the structure of a section of a peptidoglycan molecule. What type of $1,4$ linkage is present, and how many peptide bonds can be seen in this section of the molecule?
- A$\alpha$-1,4; 3
- B$\alpha$-1,4; 4
- C$\beta$-1,4; 3
- D$\beta$-1,4; 4