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Let f(x)=Sec^(-1)[1+cos^(2)x] where [.] ...

Let `f(x)=Sec^(-1)[1+cos^(2)x]` where `[.]` denotes the greatest integer function
I : Domain of `f(x)` is R
II : Range of f(x) is `{Sec^(-1)1, Sec^(-1)2}`

A

only I is true

B

only II is true

C

both I and II are true

D

neither I nor II are true

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