A new client hired a penetration-testing company for a month-long contract for various security assessments against the client's new service. The client is expecting to make the new service publicly available shortly after the assessment is complete and is planning to fix any findings, except for critical issues, after the service is made public. The client wants a simple report structure and does not want to receive daily findings.
Which of the following is most important for the penetration tester to define FIRST?

A. Establish the format required by the client.
B. Establish the threshold of risk to escalate to the client immediately.
C. Establish the method of potential false positives.
D. Establish the preferred day of the week for reporting.