what Research strategies would you use to find out the following information?

What research strategies would you use to find out the following information
(a) customer satisfaction with a new product
(b) how well a new employee is performing
(c) effectiveness of company email
(d) tourism trends in Australia

a. face-to-face interviews

b interview with his boss

c look at sales charts and compare to the number and time of emails

d people getting off planes. count the number.