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A bar of Gallium Arsenide (GaAs) is doped with silicon such that the silicon atoms occupy Gallium and Arsenic sites in the GaAs crystal. Which one of the following statements is true?

1. Silicon atoms act as $p$-type dopants in Arsenic sites and $n$-type dopants in Gallium sites
2. Silicon atoms act as $n$-type dopants in Arsenic sites and $p$-type dopants in Gallium sites
3. Silicon atoms act as $p$-type dopants in Arsenic sites as well as Gallium sites
4. Silicon atoms act as $n$-type dopants in Arsenic sites as well as Gallium sites