Final answer:
In troubleshooting a cloud application access issue, the last step is documenting the findings and actions taken. This ensures that the solution is recorded for future reference, training, and prevention of similar problems.
Step-by-step explanation:
Marcus is troubleshooting a customer's inability to access a cloud application, and it is important to follow a methodology for problem-solving in technology-related fields. The last step that Marcus should complete in the troubleshooting methodology is A. Document the findings and actions taken. This step is crucial after resolving the issue because it helps ensure that the solution is recorded for future reference, provides a basis for training and helps in preventing similar issues. Throughout the process, Marcus would engage in gathering information from customers and other stakeholders, finding expert information, and performing a root cause analysis to address the underlying cause of the problem.