I$-$ Given the below shown network topology exhibit :

a$-$ How many collision domains exist? Justify your answer.

b$-$ How many broadcast domains exist? Justify your

answer.

c$-$ The HUB is replaced by a router. How many collision as

well as broadcast domains are there? Justify your

answer.

Note: this is the $2$nd time i post the smae questions $,$ please look at the digram carefully and then solve the question.