Refer to the exhibit. PC$1$ attempts to connect to File$\_$server$1$ and sends an ARP request to obtain a destination MAC address. Which MAC address will PC$1$ receive in the ARP reply?

the MAC address of the G$0/0$ interface on R$2$

the MAC address of the G$0/0$ interface on R$1$

the MAC address of File$\_$server$1$

the MAC address of S$1$

the MAC address of S$2$