Consider scanning literals for representing carbohydrates in chemistry. Such literals consist of one or more parts, each consisting of C, H, or O, optionally followed by a decimal integer greater than 1 (it can greater than 9). You may use D0 to mean decimal digits 09, D1 to mean 19, and D2 to mean 29.1 (a) Give a regular expression for these carbohydrate literals. You may use the iteration operators * and + and ?. (b) Give a DFA that recognizes exactly these literals (no edges). Dont forget to mark the start state and all accepting states.