CMMI practices specify what actions to take. How do they describe the method of doing these actions?

The reasoning behind the correct answer lies in the nature of the CMMI framework. CMMI practices are designed to guide organizations on what actions they need to take to improve processes and achieve maturity. However, they intentionally do not prescribe how these actions should be implemented. This allows organizations flexibility in determining the methods and approaches that best suit their unique environments and needs.

By not specifying how actions should be carried out, CMMI encourages organizations to adapt practices to their specific context and to leverage their existing capabilities and resources. This promotes innovation and tailored solutions rather than a one-size-fits-all approach.

In contrast, the other options suggest a level of specificity or prescriptiveness that is not characteristic of CMMI practices. For instance, providing detailed instructions would limit organizations' ability to customize their processes, while defining multiple approaches or assigning responsibilities would imply a level of guidance that CMMI intentionally avoids to promote flexibility and adaptability within organizations.