Ad-Hoc配置管理Proxy（即Nginx）安装Nginx，执行命令：（）

A.ansible proxy -m yum -a"name=http：//nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm state=present"
B.ansible proxy -m yum-a"name=nginx state=present"
C.ansible app-m yum -a"name=nginx state=present"
D.ansible proxy -m yum -a"name=/usr/local/src/nginx-release-centos-6-0.el6.ngx.noarch.rpm state=present"