The function defined by \( f(x)=\left\{\begin{array}{l}3 x-7, x \le...

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The function defined by \( f(x)=\left\{\begin{array}{l}3 x-7, x \leq 4 \\ 4 x+9, x4\end{array}\right. \) is
\( \mathrm{P} \)
(1) continuous on \( x \in R \)
(2) continuous on \( x \in R^{+} \)
(3) continuous on \( x \in R-\{4\} \)
(4) none of these
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