A common-source amplifier with a drain resistance, $R_{D}= 4.7\:k\Omega$, is powered using a $10\: V$ power supply. Assuming that the transconductance $,g_{m},$ is $520 \:\mu A/V,$ the voltage gain of the amplifier is closest to:
1. $-2.44$
2. $-1.22$
3. $1.22$
4. $2.44$