If $$\sec \theta- \tan \theta= \frac{1}{{\sqrt 3 }}{\text{,}}$$the value of $$\sec \theta $$ . $$\tan \theta $$= ?

• A. $\frac{4}{{\sqrt 3 }}$$
• B. $\frac{2}{{\sqrt 3 }}$$
• C. $\frac{2}{3}$$
• D. $\frac{1}{{\sqrt 3 }}$$