What is the combination of methods that could be applied into original research?

a) Gather data from existing information and not by collecting information through interviews
b) Build up a sampling strategy and analyze only a specific type of framework without considering the larger population
c) Quantitative and qualitative research with interviews or focus groups, other than using samples to collect data through questionnaire or other PR materials techniques, such as test copy
d) Work with market segmentation and create an analysis based on general information without interviewing an audience