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If acute angle between lines `ax^(2)+2hxy+by^(2)=0` is `(pi)/6`, then `a^(2)+14ab+b^(2)=`

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If acute angle between lines `ax^(2)+2hxy+by^(2)=0` is `(pi)/6`, then `a^(2)+14ab+b^(2)=`
A. `4h^(2)`
B. `8h^(2)`
C. `12h^(2)`
D. `16h^(2)`
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Correct Answer - C
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