$($a$)$ What are the critical path activities? $($Enter your answers as a comma$-$separated list.$)$

$($b$)$ What is the expected time $($in days$)$ to complete the project?

$($c$)$ Based only on the critical path, what is the probability the project will take more than $28$ days to complete? $($Round your answer to four decimal places.$)$You may need to use the appropriate technology to answer this question.

Use the following network with activities and times estimated in days to answer the questions.

$($i$)$