Final answer:
QA evaluates core base voice/video/data transport and transmission systems every 6 months.
Step-by-step explanation:
In quality assurance (QA), the evaluation of core base voice/video/data transport and transmission systems depends on the organization's policies and industry standards. However, it is common for QA to perform evaluations on a regular basis to ensure the systems are functioning properly.
One common approach is to conduct evaluations every 6 months to identify any issues or deviations from expected performance. This frequency allows for timely identification of potential problems and corrective actions to be taken.
Therefore, the correct answer is a) Every 6 months.