单项选择题

A.α-1,4糖苷键和β-1,6糖苷键
B.β-1,4糖苷键和β-1,6糖苷键
C.β-1,4糖苷键和α-1,6糖苷键
D.α-1,4糖苷键和α-1,6糖苷键