What is the simplified value of \({\left( {\frac{1}{{cosec\;\theta + \cot \theta }}} \right)^2}?\)

• A. cosec θ + tan θ
• B. sin θ + cos θ
• C. (1 - cos θ)/ (1 + cos θ)
• D. (1 - sin θ)/ (1 + sin θ)