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વિધેય $f(x) = \sqrt {2 - {{\sec }^{ - 1}}x} $ નો પ્રદેશગણ ..... છે.  

• A
  $\left( { - \infty , - 1} \right] \cup \left[ {1,\infty } \right)$
• B
  $\left( { - \infty , - 1} \right] \cup \left[ {\sec 1,\infty } \right)$
• C
  $\left( { - \infty ,\sec 2} \right] \cup \left[ {1,\infty } \right)$
• D
  $\left( { - \infty ,\sec 2} \right] \cup \left[ {\sec 1,\infty } \right)$