Which answer do I choose?

Let X be an exponential random variable with probability density function p x (2:) = e"? for .1: 2 0. Which of the answers below is the correct combination of P(2X S 2) and Var(2X)? A. 12(2x g 2) = 0.2335 and Var(2X) = 36 . 12(2): 5 2) = 0.4866 and Var(2X} = 13 . 12(2): 5 2) = 0.5134 and Var-(2X) = 9 . 12(2): 5 2) = 0.1711 and Var(2X) = 1.3333 . 12(2): 5 2) = 0.2388 and Var(2X) = 0.4444 131505