Given: specific rotation of $(+)$ sucrose, $(+)$ maltose, $\mathrm{L}(-)$ glucose, $\mathrm{L}(+)$ fructose in aqueous, solution are $+66°,+140°,-52°$and$+92°$respectively. For 'invert sugar', the correct statements are?

(a) 'Invert sugar' is prepared by acid-catalyzed hydrolysis of maltose

(b) 'Invert sugar' is an equimolar mixture of $\mathrm{D}(+)$ glucose and $\mathrm{D}(-)$ fructose

(c) Specific rotation of  'invert sugar' is $(-20°)$

(d) On reaction with ${\mathrm{Br}}_2$ water ' invert sugar' forms saccharic acid as one of the products.