You are a product manager who is using story mapping to help prioritize

different user stories. A typical user interaction with your product is search, select, purchase, and watch. How should you implement these?
a. Implement user stories in horizontal slices across the entire interaction
b. Conduct user testing to determine which area of your workflow is most important to the user
c. Implement all search and follow the implementation with user testing
d. Implement all search-related user stories, then select, then purchase and finally watch
e. None of the above