Answer:
1. Sarah - Online Focus Groups
2. Diana - Online Sampling
3. John - Online (Cloud) Databases
Explanation:
Marketing research is an important aspect for any business. The type of research tools used for any marketing strategy depends on the multiple factors like, type of product, target market and customer need. In the given scenario Sarah should go for Online focus group research, Diana should go for Online sampling and John should go for Online Cloud Databases.