To prevent problems from happening again, as occurred when providing updates such as with the iOS 11, which of the following steps should we begin with when applying Six Sigma to ensure we have a better methodology for testing our updates prior to full release?

a) Measure the current performance of the process.

b) Analyze the process to identify the root causes of the quality problem.

c) Improve the process by eliminating the root causes of the problem.

d) Define the quality problem of the process.

e) Control the process to ensure the improvements continue.