Request seller responses and select sellers is associated with which process group ？（）

A．Plannin

B．Procurement Managemen

C．Initiatin

D．Executin

下列哪个药物属于单环β-内酰胺类抗生素

A．舒巴坦
B．氨曲南
C．克拉维酸
D．磷霉素
E．亚胺培南