18 iff a) is real-valued function defined on [0, such that f (0)=0 and f (x)>0, vx, then the function h(x) f)is (a) increasing in [0, o] (b) decreasing in [0. 1

18 Iff a) is real-valued function defined on [0, such that f (0)=0 and f (x)>0, Vx, then the function h(x) f)is (a) increasing in [0, o] (b) decreasing in [0. 1 (c) increasing in 0, 1] and decreasing in [1, oo (d) decreasing in 10, 1] and increasing in [1,o iD