The network diagram below represents the stages and time frames $($in days$)$ that Mr Phelan needs to follow in order to achieve government approval in the REIPPP process for this next solar project.

$3\mathrm{.}1$: Redraw this network diagram and then perform the forward and backward passes for this phase.

$(16$ marks$)$

$3\mathrm{.}2$: Calculate and give the length of this approval process.

$(1$ mark$)$

$3\mathrm{.}3$: Give the critical path for this process.

$(6$ marks$)$

$3\mathrm{.}4$: Which activities have slack time?

$(2$ marks$)$