If $A =a_1 \hat{ i }+b_1 \hat{ j }$ and $B =a_2 \hat{ i }+b_2 \hat{ j }$, the condition that they are perpendicular to each other is
- A$\frac{a_1}{b_1}=-\frac{b_2}{a_2}$
- B$a_1 b_1=a_2 b_2$
- C$\frac{a_1}{a_2}=-\frac{b_1}{b_2}$
- DNone of these
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