The best time to consider legal and/or standard requirements for a System Under Test (SUT) is when developing a Test Automation Solution (TAS) (Option D). Legal and standard requirements often dictate specific testing protocols, data handling procedures, and compliance checks that must be integrated into the testing process. By considering these requirements during the TAS development phase, the automation framework can be designed to incorporate necessary compliance checks, data protection measures, and other regulatory obligations. This proactive approach ensures that the TAS not only effectively tests the functionality and performance of the SUT but also ensures compliance with relevant legal and industry standards, thereby mitigating the risk of legal challenges and enhancing the quality assurance process.