单项选择题
设二维随机变量(X,Y)的概率密度为f(x,y)=,则P{0<X<2,0<Y<2}=()
A.1/16B.1/4C.9/16D.1
A.2/21B.3/21C.4/21D.5/21
A.1/20B.1/10C.3/10D.3/5