The function \(\rm f(x)=\log \left(x+\sqrt{x^2 + 1}\right)\) is:

1.	The function \(\rm f(x)=\log \left(x+\sqrt{x^2 + 1}\right)\) is:
A.	An even function.
B.	An odd function.
C.	A periodic function.
D.	Neither an even nor an odd function.
Answer» C. A periodic function.

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