If $\left( {a,{a^2}} \right)$ falls inside the angle made by the lines $y = {x \over 2},$ $x > 0$ and $y = 3x,$ $x > 0,$ then a belong to :

Question

$\left( {0,{1 \over 2}} \right)$

$\left( {3,\infty } \right)$

$\left( {{1 \over 2},3} \right)$

$\left( {-3,-{1 \over 2}} \right)$

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