Which expression can be used to approximate the expression below, for all positive numbers a, b, and x, where a ≠ 1 and b ≠ 1? log a× log b× / log b Baseline a log Subscript b Baseline a Over log Subscript b Baseline x EndFraction log Subscript a Baseline b Over log Subscript x Baseline b EndFraction log Subscript a Baseline x Over log Subscript b Baseline x EndFraction