If \(\sqrt {\frac{{1 - cos\theta }}{{1\; + \;cos\theta }}} \times \sqrt {\frac{{cosec\theta - cot\theta }}{{cosec\theta \; + \;cot\theta }}} \) = \(\frac{{1 - r}}{{1\; + \;r}}\) , then the value of r is:

• A. sinθ
• B. cosecθ
• C. secθ
• D. cosθ