Your team has discovered an issue during testing, and the resolution is proving to be very challenging. They have unsuccessfully tried many different approaches to fix the issue. However, you notice their approach to fixing the issue has been haphazard and ineffective $($let$\text{'}$s see what happens if we change this factor$).$ What would be your best advice to the team?

a$.$

Use a scatter diagram to document the factors causing the outcome

b$.$

First determine the root cause of this issue using the Ishikawa approach

c$.$

Monitor the results through the use of control charts to determine the trend and where the process may be going out of control

d$.$

Plot the results of all the changed factors using the Pareto Diagram approach