Two artificial satellites, $1$ and $2,$ are put into circular orbit at the same altitude above Earth's surface. The mass of satellite $2$ is twice the mass of satellite $1.$ If the period of satellite $1$ is $T,$ what is the period of satellite $2?$

a$.$ T$/2$

b$.$ T

c$.2T$

d$.2\mathrm{.}5$ T

e$.4$ T