Context: The BBC domestic television channels do not broadcast advertisements; they are instead funded by a television licence fee which TV viewers are required to pay annually. This includes viewers who watch real-time streams of the BBC's channels online or via their mobile phone. The BBC's international television channels are funded by advertisements and subscription.

Question: How often are people required to remit the TV license fee?
Answer: annually

Question: How do the BBC's non-domestic channels generate revenue?
Answer: advertisements and subscription

Question: How often is a broadcast licence fee paid by viewers of BBC domestic channels?
Answer: Unanswerable

Question: What is it that subscriptions pay for?
Answer: Unanswerable