div1和div2是DOM结构中的关系为兄弟节点的两个div

div1和div2是DOM结构中的关系为兄弟节点的两个div元素，分别画出下列问题的效果图：
a. .div1 {width: 100px;height: 100px;position: absolute;float: left;} .div2 {width: 100px;height: 100px;position: absolute;float: right;}
b. .div1 {width: 100px;height: 100px;position: relative;float: left;} .div2 {width: 100px;height: 100px;position: relative;float: right;}
c. .div1 {width: 100px;height: 100px;position: absolute;float: right;} .div2 {width: 100px;height: 100px;position: relative;float: left;}