The OpenSAMM business function being assessed is Verification. This function involves activities related to reviewing and testing to ensure that the software meets the required security standards and practices. In the context of the question, the software security group's focus on reviewing design artifacts to ensure compliance with organizational security standards falls under the Verification function. This includes tasks such as design review, implementation review, and security testing, which are all aimed at verifying that the security measures and controls are correctly integrated into the software design.
References: The information is verified as per the OWASP SAMM documentation, which outlines the Verification function as a core business function that encompasses activities like design review, which is directly related to the assessment of design artifacts mentioned in the question1.