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Which of the following statement is/ar...

Which of the following statement is/are always true concerning the function `f(x)=x+1/x` (I)The graph of the function is symmetric about the y-axis. (II)The graph of the function has a relatively maximum at (1, 2) and a relative minimum at `(-1,\ -2)dot` (III)The graph of the function is concave up for `x >0` and concave down for `x<0.` (a)only I (b) only II (c)only III (d) only I and II

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