While I have had some struggles myself making the leap from a given exercise to the questions asked in the quizzes, this may help. The answer you are looking for is on page 403 of the pdf version of the student guide. I am pasting the paragraph that addresses the question you have referenced:

"Every data page defines a refresh strategy. The refresh strategy defines when the data page is considered stale and needs to be reloaded. Data pages are created and updated on demand. Even if a data page is considered stale, the page is never reloaded until it is referenced. The available refresh strategy options depend on the scope of the page."

Hope that helps.

-- Glenn