Consider a Paxos network with $4$ computers. Computer $1$ forms the proposer, and Computers

$2-4$ form acceptors. Also suppose that the client has requested to write a value $")$ onto the distributed

System.

$($a$)$ Draw a protocol diagram when there is no failure.

$($b$)$ Draw a protocol diagram when Computer $3$ fails in receiving the "Accept" message from the

proposer.

$($c$)$ Draw a protocol diagram when Computer $3$ fails in sending the "Accepted" message to the

proposer.

d$)$ Draw a protocol diagram when the proposer fails in sending the "Prepare" message.

Note: No other computer fails on the network.

Note: Computer $4$ takes over the proposer role if needed.

Note: Strictly mark where the timeout occurs if the proposer replacement is needed.

$($e$)$ Draw a protocol diagram when the proposer fails in receiving the "Promise"

messages.

Note: No other computer fails on the network.

Note: Computer $4$ takes over the proposer role if needed.

Note: Strictly mark where the timeout occurs if the proposer replacement is needed.