Forwarding by Routers and Switches $(20$ points$)$

Consider this network, where devices $1,3,$ and $5$ are switches, and devices $2$ and $4$ are routers:

a$)$ In the path taken by a packet sent from B to F$,$ how many frames are sent? List the source$/$destination

MAC addresses and IP addresses of each of these frames. $($Refer to the addresses by saying,

e$.$g$.,$C$$s IP$$ or $$D$$s MAC$.)$

b$)$ Now assume that device $4$ is actually a switch, and repeat part $($a$).$