实现向右的红色三角形，样式实现正确的是（ ）

A. icon{width:0; height:0; overflow:hidden; border:5px solid transparent; border-left-color:
B. f00; }
C. icon{width:0; height:0; overflow:hidden; border:5px solid
D. f00; border-left-color:transparent;}
E. icon{width:0; height:0; overflow:hidden; border:5px solid transparent; border-right-color:
F. f00;}
G. .icon{width:0; height:0; overflow:hidden; border:5px solid
H. f00; border-right-color:transparent;}