Two particles A and B are moving in XY-plane. Their positions vary with time \( t \) according t...

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Two particles A and B are moving in XY-plane.
Their positions vary with time \( t \) according to relation :
\[
\begin{array}{ll}
\mathrm{x}_{\mathrm{A}}(\mathrm{t})=3 \mathrm{t}, & \mathrm{x}_{\mathrm{B}}(\mathrm{t})=6 \\
\mathrm{y}_{\mathrm{A}}(\mathrm{t})=\mathrm{t}, & \mathrm{y}_{\mathrm{B}}(\mathrm{t})=2+3 \mathrm{t}^{2}
\end{array}
\]
Distance between two particles at \( \mathrm{t}=1 \) is :
(1) 5
(2) 3
(3) 4
(4) \( \sqrt{12} \)
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