The value of \(\sqrt {\frac{{cosec\;\phi - \cot \phi }}{{cosec\;\phi \; + \;\cot \phi }}} \div \frac{{\sin \phi }}{{1\; + \;\cos \phi }}\) is equal to∶

• A. sec ϕ
• B. 1/2
• C. 1
• D. cosec ϕ