移动端使用的公共样式是__________

A. JavaScript
B. jQuery
C. Angular JS
D. Node JS

A. col-sm-6 col-md-4，col-sm-6 col-md-4，col-sm-6 col-md-4
B. col-sm-6 col-lg-4，col-sm-6 col-lg-4，col-sm-6 col-lg-4
C. col-xs-6 col-lg-4，col-xs-6 col-lg-4，col-xs-6 col-lg-4
D. col-xs-6 col-md-4，col-xs-6 col-md-4，col-xs-6 col-md-4

A. nav-vertical
B. nav-tabs
C. nav-pill
D. nav-stacked