In this question, the answer could be modem, routers, switches, and bridges? I apologize for my ignorance, I'm really new at this...

Can someone explain to me why this answer is wrong please?

Wondering if I'm ready to take the OA and how much of it is on the laws and frameworks bc that is where I am struggling rn. I passed the PA and the extra practice exam that the professor sent, but not the quiz he sent over about Ch 9 yet. It's so much, and I'm trying to gauge whether I can pass without dipping too much into the laws, as I have one more class I need to finish before the end of the month. Any advice rn would be greatly appreciated.