Z is the present-value random variable for a special insurance on (r). You are given: (i) There are three causes of decrement. (11) Hyt = 0.005, t 2 0 (iii) Hitt = 0.010, 120 (iv) Prit = 0.020, t > 0 (v) 6 = 0.04 (vi) (1) 3, 0 10 (vii) b(2) S 2, 0 20 bitt = 1, t20 (ix) Benefits are payable at the moment of decrement. (x) E[Z] = 0.579 Calculate Var(Z). A 0.21 B 0.29 C 0.42 D 0.50 E 0.58