If `alpha,beta!=0`
, and `f(n)""=alpha^n+beta^n`
and `|3 1+f(1)1+f(2)1+f(1)1+f(2)1+f(3)1+f(2)1+f(3)1+f(4)|=K(1-alpha)^2(1-beta)^2(alpha-beta)^2`
, then K is
equal to
(1) `alphabeta`
(2) `1/(alphabeta)`
(3) 1
(4) `-1`
A. `alphabeta`
B. `1/(alphabeta)`
C. 1
D. -1
