If f(x - y) ,f(x) f(y) and f(x + y) are in A.P for all x, y ∈ R and f (0) ≠ 0 then-
If f(x+y)= f(x) f(y) for all x,y belonging to R and f(1)=2 then, area enclosed by 3|x| + 2|y| <= 8
is :-
a) f(4) sq unit
b) (1/2) f(6) sq unit
c) 1/3 f(6) sq unit
d) 1/3 f(5) sq unit