A streaming studio studies a log written by the billing system each time a paid subscription starts, renews, or cancels. Subscribers were not asked to recall a purchase. Which description fits the log?
Select an answer to reveal the explanation.
Short Explanation
The billing system writes a row when a subscription event happens, the way a register records a sale, not when someone fills out a questionnaire. The trap is hearing the word log and picturing a survey, a sensor, or an experiment. You have a transaction log generated by business events.
Full Explanation
Each row is created because a business event occurred in the billing system: a paid subscription started, renewed, or canceled. Subscribers were not asked to remember a purchase, so the file is a transaction log generated by those events. A survey would record answers people give when asked, and nobody was asked. A sensor stream would be a physical measurement from a device, such as a temperature or a signal level, and a billing state change is not that kind of measurement. Writing a row because the studio operates a billing process is not a controlled experiment; an experiment would assign a treatment and compare outcomes, and the file is ordinary event capture rather than an assignment of subscribers to conditions. Exam caveat: a transaction log can later be used inside an experiment, but using it that way does not change how this file was generated. Operational check: confirm each row carries a billing event type such as start, renewal, or cancel, and that the row is created by the billing system at the time of the event.