With the compactor's safety protection device not working, the workers were exposed to significantly greater risk. A good visual way of demonstrating and understanding this is to draw a risk matrix like the one shown below. Likelihood Very unlikely (Risk rating 1) Medium Likely Very likely (Risk rating 2) (Risk rating 3) High High Low Medium High Severity Major injury (Risk rating 3) First-aid injury (Risk rating 2) Minor injury (Risk rating 1) Low Low Medium (a) Assuming that you are teaching someone who has never seen this kind of risk matrix before (i) show how the matrix can be used to confirm that the risk level was acceptable when the compactor risk assessment was initially carried out. (ii) show how the matrix can be used to confirm that the risk level changed significantly with the safety protection device not working. Note: Show calculations and support the calculations using information, where applicable, from the scenario. (b) What additional administrative control measures could the supermarket put in place to prevent a repeat of this accident with the compactor