Scenario B:

Suppose you are given the process flowchart shown below.

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No buffer space between stations, so upstream tasks must wait if downstream task is busy or if downstream task is unable to start processing immediately

Task $4$ is an assembly stage $-$ it requires $1$ unit from task $2$ AND one unit from Task $3$ in order to do its work.

Each task can process $1$ unit at a time

Which task$($s$)$ would be starved? Check all that apply.