下列哪些案件调解达成协议的，人民法院可以不制作调解书

A．被告拖欠原告货款40万元，双方达成协议，被告保证1个月付清，原告不要求被告支付拖欠期间的货款利息

B．赔偿案件中的被告人在国外与原告达成赔偿协议，并用信函向人民法院保证一定期限内赔付

C．离婚案件中当事人双方协议离婚，被告每月向原告及孩子支付生活费500元

D．收养案件中当事人双方达成协议，维持收养关系

Virtualization is an approach to IT that pools and shares（）so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human（）are aligned around an application or business function. With a virtualized（）, people, processes, and technology are focused on meeting service levels, （）is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization（）that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

With a virtualized（）.

A．system

B． infrastructure

C．hardware

D．link