Let the function \[ f(x)=\left\{\begin{array}{cr} \frac{\log e(1+5 x)-\log (1+a x)}{x}, \text { ....

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Let the function
\( \mathrm{P} \)
\[
f(x)=\left\{\begin{array}{cr}
\frac{\log e(1+5 x)-\log (1+a x)}{x}, \text { if } & x \neq 0 \\
10, \text { if } & x=0
\end{array}\right.
\]
W.
continuous at \( x=0 \) then a is equal to.
(1) 10
(2) -10
(3) 5
(4) -5


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