A qualitative researcher conducting a grounded theory study on nurses' experiences with moral distress during end-of-life care finds that, after 12 interviews, the researcher notices that no new themes are emerging, and participants are consistently repeating similar perspectives and experiences. What concept is the researcher most likely encountering at this stage of data collection? Question 10 options: All eligible participants have been recruited, limiting further sampling. Maximum variation sampling, where the goal is to achieve the broadest range of perspectives across participant characteristics. Data saturation, where additional data no longer contributes novel insights or themes to the developing analysis. Researcher should take a break and recruit more participants for a diverse sample size