Marc has configured two VLANs on his office network: VLAN A and VLAN B. He has three switches, Switches 1, 2, and 3. As shown in Figure 5-9, Switch 1 on the first floor of Marc's office building is connected to his router. It's also connected to Switch 2 on the first floor and to Switch 3 on the second floor. VLAN A handles traffic for the Accounting Department, and VLAN B handles traffic for Sales. Both VLANs have network clients on each floor. Scanned with CamScanner Marc is having trouble getting clients on different VLANs to talk to each other, even when they're on the same floor. For example, the sales computer on the first floor can't connect to the accounting computer sitting right next to it. It's the same problem on the second floor. Which device is most likely the source of the problem? a. Switch 1 c. Switch 3 b. Switch 2 d. The router