Random variables x and Y have the joint distribution F(x,Y)(x,y)=(0,x<0 or y<0),((5)/(4)((x+e(-(x+1)y(2)))/(x+1)-e(-y(2))),0<=x<4),(1+(1)/(4)e(-5y(2))-(5)/(4)e(-y(2)),
a) True
b) False