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A small signal source $v_{i}(t)=A \cos 20 t+B \sin 10^{6} t$ is applied to a transistor amplifier as shown below. The transistor has $\beta=150$ and $h_{i e}=3 \; \mathrm{k} \Omega$. Which expression best approximates $v_{o}(t)$ ?

1. $v_{o}(t)=-1500\left(A \cos 20 t+B \sin 10^{6} t\right)$
2. $v_{o}(t)=-150\left(A \cos 20 t+B \sin 10^{6} t\right)$
3. $v_{o}(t)=-1500 B \sin 10^{6} t$
4. $v_{o}(t)=-150 B \sin 10^{6} t$