2. Which of the following cannot be a probability density function on the domain given? Select all that apply. O p(ac ) = 1 7 1+ 72 on [0, too). p(20) = 1 2 TT + sin x on [0, 27] 1 10 on [0, 9] p(20 ) = on [1, too). p (20) = 1 10 on [0, 10] O p(ac) = 2 1 T 1 + 72 On R = (-0o, too)