The sum of two fractions is $$4\frac{2}{3}$$. If the smaller fraction is $$1\frac{1}{4}$$, what is the difference of the two fractions? Leave your answer as a mixed number. 
选项为:A:$$2\frac{1}{6}$$  B:$$3\frac{5}{12}$$  C:$$4\frac{5}{12}$$  D:$$5\frac{11}{12}$$  请回答其中一个选项.